I make a living on a 20 foot press brake. That means everything I do has to do with angles. Over the years I've had all kinds of protractors, from Sterrett to Mitutoyo and five or six others. My go-to protractor is Sterrett's cast iron work from a combo square set I bought for a few hundred dollars. I use both the triangle and the protractor every hour, every day. But this thing, while cheap, knocks them out of the water like a nuclear torpedo. Seriously, it cut the time in half or even more. I