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Best Calipers

Mitutoyo 500-196-30 Advanced Onsite Sensor (AOS) Absolute Scale Digital Caliper, 0 to 6"/0 to 150mm Measuring Range, 0.0005"/0.01mm Resolution, LCD
Digital calipers are measuring instruments commonly used for inspection in manufacturing to provide the precise measurements of an object. Digital calipers can take differential measurements, which are used to determine the difference in measurements between two objects, by zeroing the display at any point along the scale. Compared to dial calipers, digital calipers provide measurements that are faster, easier, and more error-free, but they are more fragile mechanically and electronically, and do not resist coolant well. Advanced onsite sensor (AOS) electromagnetic inductive sensor for resistance to dirt, oil, and water.
Reviews
"How to tell if your calipers are genuine / Buy from Amazon.com LLC. Here is how to tell if the Mitutoyo calipers you purchase here (or anywhere else) are genuine: First, and most importantly, I purchased my calipers from Amazon.com LLC because I have come to trust them as a seller, and I knew they would take care of it if I found out the calipers were not genuine Mitutoyo. Secondly, once the calipers came, I took careful note of the packaging and paperwork and took good-quality pictures of it all. I checked these important details: (1) The battery should read “SR44” and “Japan” on the battery itself (not just on the packaging), and there should be no battery already installed in the calipers."
"Very precise all around."
"I settled on these and purchased directly from Amazon (not a 3rd party seller)."
"I bought this to replace my 4" model which was too short for my application of measurein brass and headspacing."
"Mitutoyo digital caliper are without a doubt the best digital calipers you can get."
"I bought these mitutoyo's because i became very disappointed with my starrett calipers and i'm satisfied with the quality so far.The only thing i miss from my starretts is they would turn on with any movement of the jaws and no need to zero them out."
"A great tool, wish I'd just bought a Mitutoyo out the gate instead of buying 3 others and then buying this one."
"Be aware these can be counterfeit and not genuine please google to see the diffference."
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Neiko 01407A Electronic Digital Caliper with Extra Large LCD Screen | 0 - 6 Inches | Inch/Fractions/Millimeter Conversion
This caliper takes an essential tool into the 21st century with an extra-large LCD digital readout for exact internal and outside measurements accurate to .001-Inch. STAINLESS STEEL: finely polished stainless steel frame with knurled thumb roller and locking screw ensure smooth sliding and accurate positioning in use.
Reviews
"i use it to try to get exact measurements on like, 3d printed calibration shapes and some other bits and pieces i want to measure."
"Thing I like most besides ease of use and readability is the quick ability to switch between different units of measure with a press of a button."
"great tool to have if you need to find the dimensions to small or medium sized objects, it comes in a nice hard-shell plastic case that has a keeps the caliper in place so that it wont move around."
"Other wise spend the money and get a USA made Starrett 120A-6 (yes its expensive) or a Mitutoyo 500-474 or 500-196-30 if you want to be under 100."
"Moving up to this 12-inch caliper is highly convenient."
"It works well for establishing an even line for width cutting, for establishing correct measurements of parts for matboard, polystyrene or wood construction, and many other uses."
"i use it every day; i'm happy with my Neiko 01407A Electronic Digital Caliper."
"(Video Size and Quality was reduced to meet Amazons limits, Watch the full video on my YouTube GadgetClass channel). The Neiko seems to get decent reviews, probably mainly because it is the cheapest one and soo many more people have bought it, but compared to all of the other calipers in the roundup it actually scored low across the entire data set. Mitutoyo ABSOLUTE 500-196-20 Digital Caliper, Stainless Steel, Battery Powered, Inch/Metric, 0-6" Range, +/-0.001" Accuracy, 0.0005" Resolution. iGaging IP54 Electronic Digital Caliper 0-6" Display Inch/Metric/Fractions Stainless Steel Body. Carrera Precision CP9806-TF Titanium 0-Inch to 6-Inch Electronic Fractional & Decimal Digital Caliper. Carbon Fiber Digital Caliper Central Storm. Neiko 01407A Stanless Steel 6-Inch Digital Caliper with Extra-Large LCD Screen and Instant SAE-Metric Conversion. Capri Tools 6-Inch Digital Caliper with Fractional Display/MM/SAE & Extra Large LED Screen. [...]."
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Aickar Digital Caliper, Stainless Steel Electronic Digital Caliper, Digital Calipers 6 Inch with LCD Screen, Durable Accurate Vernier Caliper Tool
The Aickar Digital Caliper is indispensable for ensuring that your material dimensions are always accurate. It's perfect time to order a precision caliper with Flawless quality now! [Extra Large LCD Display] Comes with a large easy-to-read LCD screen that shows instant readings with digital numbers, makes it so much more convenient than any vernier caliper or micrometer caliper. [User-Friendly Functions] This digital caliper is equiped with a machine-grooved thumb-roller provides an easy fine adjustment, an accurate position lock for a sure adjustment, and comes with a brand new 3V battery, plus, with its 5 minutes non-operation auto-off function, this will never arrive with dead or weak batteries.
Reviews
"I am not sure how long this electronic caliper will last, but I am saying this is working as great as my Mitsutoyo! If you are looking for digital calipers for measuring, i would definitely recommend this one."
"It comes in in own case with padded cutout foam to conform with the product so it is well protected and the item will not jostle around, even if you shake the case. What is included. Digital Caliper 6 inch, IP54 Rated. Phillips Screwdriver (used to open the battery cover). Instruction Booklet. Cleaning Cloth. Extra Battery (CR2032 3V Lithium Button Battery). This will measure in MM, Inches and Fractions. MM - given up to 2 precision. Inches - given up to 3 precision, eg."
"I just got this, so no long term reviews, but it is well built - you can just tell from handling it."
"A useful and accurate tool to use."
"I bought this to go with my gunsmith tools."
"1. lots of calipers are plastic -- nice for weight -- but they all seem to have bad reviews about the batter cover coming off. 2. i find the best test is to open and close the thing fast and see how much it's off."
"The product needs to measure and it does it very well."
"Good finish on product no nasty sharp edges, product appears to work well I have used it to measure known calibrated blocks and comes out pretty good, I like the easy change from inches to metric and the fractions is very handy also."
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Best Caliper Gages

Laser Measure Distance Meter ft - uMeasure MS-40A (2017 New Technology) 131 Feet with Bubble Levels for Distance Pythagorean and Area,Volume Calculation,Accuracy ±1.5mm 1/16" 2x AA Batteries
Specifications: Power Failure Memory: Don't worry about your power failure, with 20 groups data memory,makes your work more efficient; Long Life Customer Money-Back Guarantee:If you are not satisfied with the laser measure just return it for a full refund,no questions asked, no hassle.
Reviews
"It can figure square footage, volume and give you a straight line measurement within a 1/16"."
"At the same time if the measurement was wrong, you will not be able to delete it from the ongoing list of measurements - although if you keep in mind that the saving of ongoing measurements is an aid, it should not be of concern - to me it is not."
"Works fine, lightweight, accurate, Seems plenty rugged enough for home use."
"Have been testing this thing for accuracy , at least for up to 50m/160' it's good but according to instruction manual over time it'll become less accurate. (PITA). as i expect for a new item it should work correctly for the first 12 months, if it does not i will reduce the stars to match performance."
"If you want to measure an object where you have easy access to both ends, then the conventional tape measure or ruler works fine."
"This is so much faster than my old manual way of measuring, I don’t know how it works but I am just glad it works and saves me time."
"We are going to move and need measurements of walls, windows, areas where we can put furniture, etc."
"I liked using this, very easy to figure out the basics."
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Best Caliper Kits & Sets

Aickar Digital Caliper, Stainless Steel Electronic Digital Caliper, Digital Calipers 6 Inch with LCD Screen, Durable Accurate Vernier Caliper Tool
The Aickar Digital Caliper is indispensable for ensuring that your material dimensions are always accurate. It's perfect time to order a precision caliper with Flawless quality now! [Extra Large LCD Display] Comes with a large easy-to-read LCD screen that shows instant readings with digital numbers, makes it so much more convenient than any vernier caliper or micrometer caliper. [User-Friendly Functions] This digital caliper is equiped with a machine-grooved thumb-roller provides an easy fine adjustment, an accurate position lock for a sure adjustment, and comes with a brand new 3V battery, plus, with its 5 minutes non-operation auto-off function, this will never arrive with dead or weak batteries.
Reviews
"I am not sure how long this electronic caliper will last, but I am saying this is working as great as my Mitsutoyo! If you are looking for digital calipers for measuring, i would definitely recommend this one."
"It comes in in own case with padded cutout foam to conform with the product so it is well protected and the item will not jostle around, even if you shake the case. What is included. Digital Caliper 6 inch, IP54 Rated. Phillips Screwdriver (used to open the battery cover). Instruction Booklet. Cleaning Cloth. Extra Battery (CR2032 3V Lithium Button Battery). This will measure in MM, Inches and Fractions. MM - given up to 2 precision. Inches - given up to 3 precision, eg."
"I just got this, so no long term reviews, but it is well built - you can just tell from handling it."
"A useful and accurate tool to use."
"I bought this to go with my gunsmith tools."
"The finger roller is a nice touch and makes moving and measuring much easier to do accurately."
"The product needs to measure and it does it very well."
"1. lots of calipers are plastic -- nice for weight -- but they all seem to have bad reviews about the batter cover coming off. 2. i find the best test is to open and close the thing fast and see how much it's off."
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Best Dial Calipers

Anytime Tools Dial Caliper 6" / 150mm DUAL Reading Scale METRIC SAE Standard INCH MM
Dial caliper with dual reading faces showing inch readings in black and metric readings in red. Hardened stainless steel throughout.
Reviews
"Dial was dead-flat accurate, with/between both indicators."
"Great product, great quality feel, great price."
"Having both scales on the dial is great (and the reason I bought them) as I only need to have one pair of calipers with me now and don't need to convert stuff one way or the other."
"So I got this set of dial calipers. I'm not sure what one rotation of the inch hand would be."
"I use this thing all the time when installing gun parts."
"I wish the measuring window wasn't cheap acrylic, but its a minor detail."
"First thing I did when I got it was to measure some items of known size. The SAE / metric dial allows this caliper to measure for both systems accurately, and the two separate needles going around are very readable, and also look cool."
"I usually use Mitutoyo, but I got one that I didn't really have to care about too much for measurements where accuracy isn't vital, but I'm surprised at the quality of this tool."
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Best Digital Calipers

Neiko 01407A Electronic Digital Caliper with Extra Large LCD Screen | 0 - 6 Inches | Inch/Fractions/Millimeter Conversion
STAINLESS STEEL: finely polished stainless steel frame with knurled thumb roller and locking screw ensure smooth sliding and accurate positioning in use.
Reviews
"i use it to try to get exact measurements on like, 3d printed calibration shapes and some other bits and pieces i want to measure."
"Thing I like most besides ease of use and readability is the quick ability to switch between different units of measure with a press of a button."
"great tool to have if you need to find the dimensions to small or medium sized objects, it comes in a nice hard-shell plastic case that has a keeps the caliper in place so that it wont move around."
"Other wise spend the money and get a USA made Starrett 120A-6 (yes its expensive) or a Mitutoyo 500-474 or 500-196-30 if you want to be under 100."
"Moving up to this 12-inch caliper is highly convenient."
"It works well for establishing an even line for width cutting, for establishing correct measurements of parts for matboard, polystyrene or wood construction, and many other uses."
"(Video Size and Quality was reduced to meet Amazons limits, Watch the full video on my YouTube GadgetClass channel). The Neiko seems to get decent reviews, probably mainly because it is the cheapest one and soo many more people have bought it, but compared to all of the other calipers in the roundup it actually scored low across the entire data set. Mitutoyo ABSOLUTE 500-196-20 Digital Caliper, Stainless Steel, Battery Powered, Inch/Metric, 0-6" Range, +/-0.001" Accuracy, 0.0005" Resolution. iGaging IP54 Electronic Digital Caliper 0-6" Display Inch/Metric/Fractions Stainless Steel Body. Carrera Precision CP9806-TF Titanium 0-Inch to 6-Inch Electronic Fractional & Decimal Digital Caliper. Carbon Fiber Digital Caliper Central Storm. Neiko 01407A Stanless Steel 6-Inch Digital Caliper with Extra-Large LCD Screen and Instant SAE-Metric Conversion. Capri Tools 6-Inch Digital Caliper with Fractional Display/MM/SAE & Extra Large LED Screen. [...]."
"If you look at the jaws for measuring internal dims, you can see it is dinged."
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Best Joint Calipers & Dividers

Tacklife DC01 Digital Caliper Carbon Fiber / Plastic 6 Inch with 2 inches Wide Super Clear Display Inch/Fractions/Millimeter Conversion
The zero distance also can be set at any distance, helpful in measuring deviations from a standard distance;with one button users can easily change the measuring model to Millimeter, Inch, Fractions only through one button controlling. Enter your model number to make sure this fits.
Reviews
"It comes with a manual and a warranty card which makes your purchage authenticate and valuable."
"My husbang was the one who use it, He was excited to buy it because he was browsing on the amazon and he said he needs this at work, Infairness to the seller he said it was a good quality material compare to what he bought before."
"The last thing I used it for was to replace a missing part from one of my models, so I measured it from one that is not missing and it measured accurately for my print."
"Nice big screen for those of you who have vision issues and it is extremely accurate."
"It is all plastic which surprised me but seems to work fine still."
"It works, but the accuracy can be inconsistent and require multiple attempts."
"The only thing I don't like is that the display depth is massive."
"Plastic didn't go well with precision measurement tool."
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Best Vernier Calipers

VINCA DCLA-1205 Quality Electronic Digital Vernier Caliper Inch/Metric/Fractions Conversion 0-12 Inch/300 mm Stainless Steel Body Red/Black Extra Large LCD Screen Auto Off Featured Measuring Tool
External Calibration We TEST VINCA DCLA Digital Caliper external measurement accuracy BEFORE selling. Higher quality lower price stainless steel digital caliper with inch/metric/fraction conversion; Home DIY and professional use are both highly recommended.
Reviews
"Repeatably with measurements is spot on, they glide smoothly along the track, and feel of a higher quality in your hand. At first I was unsure on this one because it lacked the finer measurements on the body, but they arn't really needed, long as it doesn't die on you."
"I have hesitated to buy one of these for a long time, but after several random things I wanted to measure accurately and couldn't, I finally broke down and bought one."
"I bought this caliper as it was very similar to what I used to use in my previous work and I used it a lot to measure thickness, mostly of the stucco finish. The one I used at work was a branded version and I think it cost them about $100 plus."
"of a circular object, with a tape measure. This is a physically beautiful tool that's well constructed with all the features I would want (and I'm an engineer)."
"You can buy a few of them and still be under the price of the top brands and they work just as good without a doubt!"
"Only issue I have is if you used more expensive calipers in the past, you might have a learning curve with this one."
"My husband was so excited when he saw these calipers!"
"The best Pro I like is that you can tap on the button while using the Caliper to change from Milometers, to Inches, or to Fractions, which is a plus & also a learning function for those of us who don't fully understand that some MM can be equal to Inches/Inch, or can be equal to fractions because some accessories may only be available in lets say Milometers, or in the other 2 types of measurements. Con's: Unlike some of the older, or even the cheaper types of Calipers, you have the 2 ruled measurements, 1 in 1/16th of inches & the other side, MM, plus an LCD Display."
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Best Micrometers

Mitutoyo 293-340-30 Digital Micrometer, Inch/Metric, Ratchet Thimble, 0-1" (0-25mm) Range, 0.00005" (0.001mm) Resolution, +/-0.00005" Accuracy, Meets IP65 Specifications
Style: Standard. Calibrated micrometer measures 0 to 1" (0 to 25mm) with 0.00005" (0.001mm) resolution and +/- 0.00005" accuracy, for taking outside diameter measurements in harsh workshop conditions.
Reviews
"Awesome and accurate little micrometer."
"I was looking at iGauging and some other options which looked pretty good, but when it's only a little bit more to get a genuine Mitutoyo where you really don't have to stress as much about getting a good one that is in spec, it's worth it."
"I bought it to replace a much more expensive Interapid /Brown and Sharp micrometer that simply failed."
"I've always seen digital mics as a crutch until I was speaking to a younger co-worker that pointed out since we do both SAE and Metric metrology at work its much simpler and cost effective to buy digital micrometers because by the time you buy two quality analog mics you have two to three times the money in them."
"Like the stars say, I love it...but, no cut-off switch."
"excellent quality and great workmanship from Japan."
"Excellent."
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Best Indicators

Tacklife Advanced Laser Measure 196 Ft Digital Laser Tap Measures with Mute Function Laser Measuring Device with Pythagorean Mode, Measure Distance, Area and Volume Black&Orange
Functions and Specifications ✔ MIN/MAX distance tracking. ✔ 20 measured value will be remember. ✔ Automatic calculation of area, volume and. ✔ Low battery indication. ✔ Measuring units: M/in/ft. ✔ Historical memory: 20. ✔ Battery type:AAA 2 x 1.5V(Included). ✔ Laser Class II, <1mW power output. Package Content: 1* Tacklife Laser distance measure. 1* 1.5V AAA batteries. 1* User's manual. 1* Belt clip. 1* Hand strap. 1* Gift-box. 1* 24 Months warranty. ▲DURABLE AND HANDY - IP54 waterproof level and dust-proof function protect the laser distance measure to the maximum extent; Portable size and hard rubber body provide a good grip; Wrist strap lets you hold the meter steady and carry easily.
Reviews
"It sure beats a measuring tape for measuring room size, so I would recommend it to real estate assessors and builders. The belt clip is adequate, although not as good as the one on Garmin’s InReach Explorer, which has a back-angled stop that prevents drops when it is accidentally bumped (photo)."
"Professional was impressed by how close we were in our measurements, we were only off because we did not deduct for cut out area like sink and stove."
"Measuring with a laser requires either the use of a level or some sort of level surface to work off of and it's surprising how far off your measurements can be if you don't use the level properly."
"Once I learned the interface quirks, the device works great."
"It takes a bit to figure out all the options on the laser measure, but it seems to be very accurate and is so much easier than using a measuring tape."
"It measures out to 80 meters (actually to many scales from metric to feet down to the hundredth of a foot) combine this with the AdirPro 708-01 it will measure accurately down to 1/16 of a inch out to 80 meters and it will do volume, height and distance and calculations automatically."
"My architect borrowed this one from me and wouldn't give it back after their more expensive one just stopped working."
"Bright days are problematic but much of the problem is just trying to locate the laser."
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Best Snap Gauges

YPG C2 Adjustable Limit Snap Gage with Hardened Steel Anvils, 1/4"-1/2" Measuring Range
Sound, structurally stable, design and specifications, coupled with a highly experienced, solid manufacturing and quality management system, guarantees YPG Adjustable Limit Snap gages supplied into the USA market are of the highest quality. This certification encompasses the entire organization and confirms the company's management system meets the required standard and in particular confirms the desire to exceed customer expectations and to be continually improving the products and services offered.
Reviews
"Inexpensive and yet solidly made and calibrates perfectly."
"Time will tell how good of tool this item is but so far the gauge is working great."
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Best Depth Gauges

Wixey WR525 Remote Digital Readout
It's perfect for router lifts, and can also be used on shapers and other woodworking machines.The gauge is accurate to within .001 inch, and displays its digital measurements in either decimals (inches and millimeters) or fractions (inches). Accuracy Specifications: Decimal: +/- .001 Fraction: +/- 1/500 Metric: +/- .05 Additional Specifications: Adapts to most commercial router lifts. The WR525 is a kit that can be adapted to a number of woodworking machines, including router lifts, router tables, and shapers. The large easy to read display reads in inches with fractions or millimeters. The fractions are displayed using "Precise Fraction Technology" which gives you 4 times the accuracy of other fraction readouts. Remote display for flexible mounting options.
Reviews
"Very easy to shift your router up or down any exact amount without having to eyeball a ruler, count revolutions, or grab your height gauge."
"Too bad we could not get the Jessem Router lift with the Accurate Technologies digital measuring gauge."
"The QC issue was that it didn't work with either of the 2 coin batteries that came with it, I do realize that they didn't have to ship it with batteries at all, BUT if you're going to include batteries, why not send good ones, I mean there are other ways to dispose of your toxic waste."
"As a professional woodworker, I require accuracy in my work and the Wixey gives me that...I can now adjust the height of my router bit quickly and know it is right."
"i dont think you can appreciate it what i am saying until you actually use and cut/machine things to the thousandth of an inch. mr wixey is very fast in helping resolve anything you dont understand about set up."
"Product works perfectly five star for sure, just make sure your lift has little or no backlash otherwise the unit is a bit challenging to use."
"I installed this digital readout on a Rockler router lift."
"Very hard to set up, I'm a fan of their products, but this one should be discontinued."
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Best Layout Tools

Amenitee Universal Angularizer Ruler - Full Metal Multi Angle Measuring Tool-Ultimate Template Tool-Upgraded Aluminum Alloy Multi Functional Ruler(Black)
Durable and Firm. Don't worry about handling your ruler delicately, made of premium quality aluminum alloy. HIGHLY VERSATILE: Amenitee® Multi-Angle Measuring Ruler slides and locks into any desired angles to save you time on repetitive measurements. No need to create a new template for each new job or remeasure the same angles over and over again- the measuring tool saves you both time and effort!
Reviews
"I have had the "yellow plastic" version of this tool from Home Depot General Tools 836 Angle-izer Template Tool for years and use(d) it regularly as a carpenter. I wanted the Gold Version (I like really nice tools) of this tool but the black showed up in a Lighting Deal so bolted (see what I did there) to the computer and ordered it."
"I originally bought this tool for my husband but then had a great idea to use it for a mat (for a picture frame) that I was trying to cut It worked so well."
"This is one of those tools that you just can not figure out why it hasn't been made for longer, and why it took so long to try it out."
"My girlfriend's sister, who is a PE and civil engineer, requested this for Christmas."
"This was a gift for my father, a real crafty dude."
"Got this as a stocking stuffer for my hubby but I already used it myself for a craft project cutting fabric for lining an entertainment center."
"Got this as a gift for my husband as he had mentioned a few projects where it would be useful to have this type of tool."
"Given as a Christmas gift."
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Best Height Gauges

Wixey WR25 Mini Digital Height Gauge
The Large Easy to Read Display Reads in Inches with Fractions or Millimeters. Enter your model number to make sure this fits.
Reviews
"I'm pleasantly surprised at how well this tool holds calibration."
"This includes the battery, a CR2032. 2)."
"Takes all the guess work out if getting your depth of cuts just right."
"Well made and functioned perfectly."
"Most helpful tool when using a router and switching out bits."
"I use it for setting the height of my table saw blade in relation to the table."
"This will help with woodworking equipment setup quickly and accurately."
"Very accurate setup for router and table saw.Easy to use and zero out."
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Best Optical Measurement

iGaging 36-LED10 Stand Measuring Magnifier, Loupe 10X with Scale LED Lighted Illuminated
Igaging Super high quality scale magnifier illuminated and distortion free.
Reviews
"Works great for seeing small text (I'm a digital printer looking at 1-3 point type)."
"This is an amazing loupe!"
"It is a little tough on batteries but you need the a "hearing aid" type battery size to fit inside the magnifier."
"The reticle in this loupe is very clear and easy to read."
"I can read things that I could not see for years."
"This magnifier is great."
"Great works great as advertised."
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Best Inside Measurement

Fowler Full Warranty Extender Dial Bore Gage Set, 52-646-400, 1.4-6" Measuring Range, 0.0005" Graduation Interval
Bore gauges are typically calibrated with a setting ring and come in two types: simple and direct-measuring. Simple bore gauges are used with a caliper to transfer the hole measurement, while the more complex gauges take the measurement directly, and display it through a vernier, dial, or digital display. Bore gauges have a two- or three-point contact, indicating how many points on the gauge head touch the inside of the bore. Pistol-grip bore gauges are used for fast, single-handed operation with repeatable results from one operator to another.
Reviews
"There is a red sticker on the front of the box that says "Check instructions for quantity of anvils", but the instructions are very unclear about how many are supposed to be included and where they are stored."
"However, there is not much label indicating it's a Fowler other than the indicator."
"Nice Bore gauge, As noted elsewhere there should be 3 blank spaces for the anvils, the 2 smallest of each type are shipped fitted to the heads, one (the longest) is not there in the inch set = 3 blank spaces."
"Instructions could be clearer."
"You need an additional caliber to set the base measuring point and it will then give you the difference between the base and what you are measuring."
"Does a very good job for what I need it for."
"Good piece and helped my engine build."
"Update to original review below: After returning the instrument described below, I bought Fowler's 52-646-500 which has much better accuracy and appears to be suitable for engine work. Would be nice if Fowler or Amazon were aboveboard and honestly and OPENLY disclosed in the advertising that the accuracy of this gauge is only plus or minus .0009 inches, and repeatability is only guaranteed to be within plus or minus .0004 inches which values essentially make this "measuring" tool useless for any actual precision work on a modern engine where, say, the allowed out of round is .0004!!"
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Best Reference Gauges

Wixey WR300 Type 2 Digital Angle Gauge with Backlight
Super strong magnets hidden inside the bottom of the gauge securely attach the digital angle gauge to saw blades. Press the ZERO button to calibrate the angle gauge to any reference surface.
Reviews
"I bought this product, because I have a really old table saw and it just has hash marks on the side to tell you your angle. The table was close, but I would have cut incorrect angles if I used those marks to set my angle. They recommend setting the blade to 90deg off of the table saw, then putting it on the blade and zeroing it out again. By leaving it zeroed to the table, I could put the device on the blade, adjust it, then let it find it's center of balance, check that the table was still at zero(taring it if not) then returning it to the blade to make sure it was still 75deg, which is what I was shooting for."
"I measured it against a digital angle finder ruler by balancing it on the edge of one of the thin steel rulers (this is a feat in itself--that the magnet held this device in place on such a thin piece of metal, even while adjusting the angle to almost 90 degrees)."
"However, when you turn it 180 degrees and use it in that position it becomes very difficult if not impossible to read the screen."
"I used this to set the angles of my driveshaft."
"I'm luckily getting older and don't see as well as I used to, and always set my say blade by eye with a square."
"- I was able to set up my saws and stuff much more accurately than with a T-square or angle square."
"I bought it due to the great reviews I had seen in forums and at amazon and I'm happy I finally went ahead and got one."
"This gauge is small and easily stored when not in use and fits my needs exactly."
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Best Thickness Gauges

Malco FCG2 1-1/4 Inch Overlap 5/16-Inch Thickness Fiber Cement Siding Gauge, 2-Pack
Strong, one-piece tempered spring steel construction with precision-ground tip assures gauge will grip behind siding plank. Malco FCG2 1-1/4 Inch Overlap 5/16-Inch Thickness Fiber Cement Siding Gauges are used to permit one-person application of fiber cement siding by completely freeing the installer's hands. Nail the plank in place leaving an area of about 18 inches over each gauge unnailed. Allows 1-person installation of siding planks.
Reviews
"A good job starts with the very first (bottom) row being installed straight and level."
"I decided to try these because I was tired of always having to find help if I was building a shed or garage that needed lap siding."
"I read the description of this tool but didn't completely understand how it worked but the price was right and I decided to take a chance."
"There is nothing like having exactly the right tool for the job."
"I mean if you are going to do it for a living go ahead bud one or two jobs it is awesome and well built."
"They do not hold the siding exactly at the correct amount of overlap, therefore they should be used to rough hold the siding until you get a couple of nails in."
"I was able to install all of the siding myself and it works perfectly."
"I began using them several weeks later and all was well until I put a level on the second row."
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