I love this protractor. It allows you to be extremely accurate for small angles. I have found it to be priceless. No I take that back it's worth every penny it cost plus ten times more. I have recently been getting into the art of segmented bowl turning on my Lathe. This protractor is amazing for helping me to mark the exact angle needed for each piece to match perfectly. The only other way to get as accurate of angle is to maybe use a two or three foot protractor and then you might be as close as this 6 inch tool is. I can now make accurate setup jigs in just minutes and at pretty much any angle I might ever need.