4 in 1 Digital Protractor - Measure not only length, but also 360 angle (inside angle, outside angle). Locking Feature Use locking screws to lock both legs in the desired position or angle. 1" Large LCD Display - This metal protractor with electronic LCD digital display, you can switch between degrees and minutes with "/" button "HOLD" button stores data during measurement, "ON" button /OFF/Zero resets data to zero by short pressing any angle; angle lock button for each angle. Length, width and precision - Length measurement: 400 mm; measuring angle: 000.0~999.9; precision ; 0.3; resolution: 0.1; measuring range: 0-360. The ruler body is forged from high quality stainless steel, which ensures quality, corrosion resistance and durability. EXCELLENT QUALITY - High quality forged stainless steel electronic protractor is laser engraved (mm and inch scale), abrasion resistant and corrosion resistant. The analog protractor on the protractor does not lose color when in use, and the scale remains clear even after a long time.