iFJF Miter Saw Protractor Replacement for Model #505P-7, Miter Angle Finder with Laser Dial for Carpenters, Plumbers, and Building Trades, Also Invaluable for Home Use and DIYers;

set your saw to the angle that you read on the protractor. Upside down or backwards, the reading is always correct. The easy-to-use tool has two scales. The Miter Cut Arrow and Inner Scale indicate the exact miter saw setting for an accurate miter joint every time. The Single Cut Arrow and outer scale indicate the exact miter saw setting for fitting a single piece to an angle.