Review on Enhanced Precision with Preciva Protractor: Stainless Steel and Multiple Functions at Your Disposal by Fred Meeks

Angle viewfinder well built, easy to use, worth the price and accurate. I gave it four stars instead of five because it's missing a feature. (If I had read further into the product details I would have known). I bought it to find molding angles for sloping ceilings. Most angle finders do the math for you when you turn them upside down or press a button based on a right 180 degree angle. It's not like this. For example, if my angle is 134 degrees, other angle finder brands will automatically subtract 134 from 180. I thought it was the function of the "backward" button, but I was wrong. I'll save this, but I just need to do a quick math to find the cutting angles on the miter saw.