2 in 1 Quick and Accurate Angle Finder The combination of a digital angle finder and a stainless steel ruler provides quick and accurate measurement of angle and length (metric and imperial); the hinge mechanism on the angle ruler allows full 360 degree measurement of internal and inverted angles with an accuracy of 0.2; and 0.1 resolution. Large LCD DisplayThis digital protractor is equipped with a large LCD display, so you can get quick and accurate readings as you work. Hold/Rev function You can hold the reading by pressing the HOLD function button, pressing the Rev function button, you can flip the screen to read when measuring wide angle, Easy to read, the laser engraving scale, clear and accurate. Zero Adjustment FunctionOur angle finder also has a zero adjustment function, and you can perform a zero adjustment. zero adjustment at any angle under the relative angle of measurement with the push of a button; the locking screw is used to maintain the measured reading at all times; it will automatically shut off after 6 minutes of inactivity. Stainless Steel Angle Ruler The angle finder of the protractor is made of durable stainless steel, which can be used longer than the plastic one. plastic; and powered by one CR2032 button cell to work for over 2000 hours, so you can pull-push the button box to change the battery easily. (CR2032 battery included).