This protractor works well. It's good for adjusting the blade angle on a table saw and the table angle on drill presses, band saws, spiral saws, etc. I also do a lot of difficult angle welds of steel plates. I also use it to determine the angle of my rifle when shooting uphill or downhill. Rangefinders do not calculate the x-axis distance, which is the gravitational effect of bullet drop distance. It is very necessary above 20 degrees. Great device.