3.52 ounces
10.5 x 5.75 x 0.75 inches
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Buyer's Reviews 1990

This is a good idea, but quality control is poor and there is no customer support from Starrett. The first letter I received was more than one degree short. The second letter I received was accurate! Thanks again to Amazon for providing you with excellent customer service. If you get an accurate one, then it will be a good tool. The perimeter of the dial is large enough to remove the tool from the corner of the taped plasterboard wall and is easy to read. With regard to the first tool, I chose to contact Starrett directly instead of returning it to Amazon immediately. I have some of my father's musical instruments made by Starrett, and I cherish them very much. They were all excellent, and at that time Dad only bought Starrett measuring instruments. Update: I called Starrett and their reaction was basically that it was a "Chinese hand tool" and therefore did not meet Starrett's expectations for accuracy. Conclusion: if you are one of most people and get a fairly accurate instrument, then it is quite convenient, otherwise, it is a good chewing toy for dogs. Frankly, I don't understand why Starrett allows their company names to be placed on an inconsistent and accurate tool. My mechanic dad was rolling in the grave. But I like the exact one.

8 ounces
9.53 x 2.68 x 1.34 inches
1 CR5 batteries required.
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Buyer's Reviews 757

I live on 20 feet of brakes. In other words, everything I do is about angle. I've had all kinds of protractors over the years, from Sterrett to Mitutoyo and five or six others. My good protractor is a Slater cast iron work, from a combination square set, I bought a few hundred dollars. I use triangles and protractors every hour every day. But this thing, though cheap, blew them out of the water like a nuclear torpedo. Seriously, this reduces the amount of time I spend checking the angle by half or more. Its accuracy is decent (within the store tolerance of 1 degree, of course), and it is very easy to use. Digital readings are easy to read, a blessing to my poor, tired eyes. If I don't wear presbyopia, I can hardly understand my old Sterritt, because I can't wear it while I'm running the machine. So I've been changing my glasses. Yes, I have bifocal safety glasses, but it is painful to use them when operating my machine.) But there are some downsides. On the bad side, I'll be happy to live. First of all, this thing is very cheap. In my environment, I don't expect it to be more durable than a battery. That's fine. For the price and the time I saved using it, I just bought another one! But this is a drawback. Second, the battery is easy to fall off. Unlike some other devices, you can't easily tape a closed battery box. But, oh, okay. It won't keep falling, it's just enough where it's closed. Push the tray and.

3.2 ounces
7.28 x 2.56 x 0.59 inches
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Buyer's Reviews 262

I like the exact facts of this tool. The number is good, but you must carefully calculate the line it refers to. I had to go to UTube to see how a person used it. Be sure to turn it to the right place to dial you. I used it on the kickboard in the kitchen, at a strange angle. Plan to use it on all the kick boards in my fillet house.

12.3 x 4.7 x 0.1 inches
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Buyer's Reviews 341

The only problem with this product is its sales picture. The work I do compares exams and uses the goniometer all the time. So much so that I know that the most difficult part of using a goniometer is usually to read the numbers above it. This picture can't do the justice of this baby! For ease of use, it displays the numbers on a white background. I know most of the comments are from laymen who recover from injuries, so I'm worried, but how can you make a mistake for $7? A: you can't. My goniometer didn't get to the sun, so it didn't melt. Seriously, this thing is strong. I'm so happy!

General Tools
3.68 ounces
12.5 x 3.88 x 1.63 inches
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Buyer's Reviews 453

I ordered one of them to stay around the store, the ratio of the first to arrive was inaccurate, about 1 degree, and when checked against the box of the mechanic who verified it, the reading was 89 degrees. Before using it to do anything, be sure to check your gauge with the mechanic's box. Obviously, when you use it to transfer the angle to copy or create the reciprocal of the angle, you don't actually measure the angle, you just use it as a transfer tool, then that's not a problem, but when you use it to actually measure the angle, it's frustrating. Needless to say, that unit has only one star. However, I decided to give the manufacturer / Amazon another chance before leaving my comments. I contacted Amazon about the issue, sent a replacement immediately and arrived two days later. They didn't ask for the original to come back, so one could also be used to shift the angle, and I gave it to a colleague and warned about the scale so that he could use it as a transfer tool. The replacement is accurate! Note that this is not a "precision scale" because the mark of the reading angle itself is about 0.5 mm, wide, which provides room for manoeuvre for the possibility of slightly misreading the scale, but it puts you in a general position, and when replaced, when measured with the mechanic's square, it actually falls at 90 degrees. This is a rugged gadget, very simple. If the scale is accurate, there won't be too many mistakes.

2.2 x 2.4 x 1.2 inches
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Buyer's Reviews 299

All this time I was wondering how far off my miter saw was. After using this it was easy to see it was off just a fraction (.1-.15). I have been eyeballing these guages for quite some time now, and am very happy that I finally was able to get one.It works great! The screen is very easy to read. It is also very easy to zero out. This will make setting up my miter saw and my table saw to cut angles much easier. Very easy to use, and the magnetic bottom is very helpful. Just stick it on the saw blade and set the angle.No complaints about this product at all!

Calculated Industries
4.8 ounces
8.5 x 1.5 x 0.75 inches
1 CR2 batteries required. (included)
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Buyer's Reviews 91

Finally, a digital goniometer is accurate. I make segmented bowls on the lathe, and the equipment is well within its specifications. Don't waste your time. Take this.

Johnson Level & Tool
7.2 ounces
1.88 x 6.19 x 10.5 inches
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Buyer's Reviews 530

I have two of these, and the first thing I do is compare them to each other, and they match perfectly. It was very important to compare the two sides at the same time when building the chassis and the suspension, which did not disappoint me. Like any angle, the larger dial, it is easier to read and more accurate you can get. These are a good medium between readability and accessibility because they will be suitable for most of the places I need to measure. I'll buy it again.

General Tools
1.6 ounces
43 x 3.8 x 0.8 inches
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Buyer's Reviews 779

I evaluated this from other product reviews. I bought this protractor for small, imprecise but repeatable settings to align two separate devices on my bike. Accurate angle is not important, but repeatability is important. It cost $5, and I thought if the protractor was easy to use, I wouldn't have made a mistake. That's what I need. It works very well. I like this small and lightweight device. This protractor is not made for large construction projects and obviously needs to be easy to handle. My only drawback is that if I had a bubble level, it would be easier for me to use. I overcame this and attached my own bubble level. I'm glad I found it on Amazon and I'll buy another one if I need to.

2.2 x 2.2 x 1 inches
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Buyer's Reviews 64

The SUV F goniometer is of great value and works well. The only reason for the 4 stars is the lag of the reading angle. Like most carpenters, I use this to set up my table saw blade. I have realized that sometimes I have to wait five seconds to adjust the pole before I can see the change in the angle indication. Wixey is almost instantaneous. The SUV F goniometer has more great features, including reducing my satisfaction with the overall product. I realized that I just need to make it work a little longer, and its accuracy can reach 1% degrees, not just 1/10.

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Customer Reviews
Manufacturer Starrett GemRed IFJF - General Tools - Calculated Industries Johnson Level & Tool General Tools -
Item Weight 3.52 ounces 8 ounces 3.2 ounces - 3.68 ounces - 4.8 ounces 7.2 ounces 1.6 ounces -
Product Dimensions 10.5 x 5.75 x 0.75 inches - 7.28 x 2.56 x 0.59 inches 12.3 x 4.7 x 0.1 inches 12.5 x 3.88 x 1.63 inches 2.2 x 2.4 x 1.2 inches 8.5 x 1.5 x 0.75 inches 1.88 x 6.19 x 10.5 inches 43 x 3.8 x 0.8 inches 2.2 x 2.2 x 1 inches
Is Discontinued By Manufacturer - - - -
Date First Available March 29, 2010 April 14, 2015 January 17, 2019 - February 17, 2007 - December 14, 2018 June 8, 2005 May 15, 2000 -
Material - Stainless steel ABS - Stainless steel - Stainless Steel Plastic Plastic -
Support Prime
Price $24.65 $20.85 $14.99 $6.95 $8.98 $22.99 $25.46 $11.03 $6.99 $22.50
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Best Construction Protractors Buying Guide

Fredrick Kidd
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If you are searching for a good construction protractor, you need to consider a few factors. In contrast to manual tools, construction protractors of the modern world will assist you through the digital screen.

After you choose the right type of protractor, it will keep its position and lead to a consistently accurate measurement. They are not only useful for your DIY home improvement project but also for large construction projects where you need angles to be measured accurately.

Easy-to-read Digital Display

If you want to invest in digital protractor, you need to make sure to buy the product, which comes with an easy-to-read display screen. This will allow you to reliably see your measurements.

Not only will it save your time but also from hassle – particularly if you are managing complex construction projects. There are some models, which have LEDs and LCDs giving you easy-to-read measurements even in daylight. The visibility of digital protractors is superior to the conventional angle finder.


If you need a specific measurement of the angle, we would advise you to go with digital protractors. These are, without a doubt, the most accurate tools, which have higher measurement capabilities with a 10th of a degree in most situations.

On the other hand, you cannot achieve such precise results with a manual protractor. In addition, if you do a DIY project – for example, the crown molding, a digital construction protractor will be handy and essential enough to get the job done accurately.

Cut Calculator

There are many advanced digital protractors, which can boast extra features such as the cut calculators. In general, this feature makes sure that every cut piece is fitted in an exact manner and according to your intentions. Imagine a cut only to find out that you were just off by one inch. This would be a waste of time and effort.

So, cut calculators usually go a long way in performing all that for you and ensuring that your pieces fit on all occasions. Keep in mind that this feature is not included in cheaper models.

Memory Storage and Battery Life

You must seek products, which come with auto-on and auto-off functionality. The purpose is to preserve the life of the battery. There are many situations where tools get down and you won’t need the protractor for a while. The auto-off feature allows the device to wind down as well as keep the life of the battery.

In addition, we don’t recommend a conventional construction protector because it can lead to inaccurate measurements. In contrast, we will always advise you to go for a digital protractor with good memory storage to secure the angles that you have set.

Additional Features

Extra components are quite handy when they are present in the construction protractor. For instance, you can search for a specific model, which has a locking highlight – allowing you to lock arms at your desired angle. It helps in different situations, particularly where your arms cannot be bolted. Therefore, you would have to keep the arms set up.