Review on RISEPRO Digital Inclinometer Protractor with Backlight: Accurate Measurements Made Easy by William Rothstein

So far everything works fine. Readings are repeatable. I use it to check that my saw blade is at 90 degrees to the table and it works very well. With the angle sensor attached to the blade with a magnet, I can fine-tune it to set it at 90 degrees. This method is easier and faster than using my machine square.