Just stick this magnetized, digital angle finder on any surface - table saw blade, miter table, even use it as a level - then just read the precise angle in seconds on the large LCD digital display. You can "freeze" that reading on the digital display by pushing the "hold" button. Press the "0%" button to gauge the angle change from initial measurement. Includes "calibrate" and "on/off" button. Durable stainless steel construction, with magnetic base.