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 LCD digital display electronic, you can switch between degrees and minutes with "/" button "HOLD" button stores data during measurement, "ON/OFF/Zero" button resets data to zero by short pressing any angle;Angle lock button for each angle. Length, width and precision - Length measurement: 400mm;Measurement angle: 000.0~999.9;Accuracy 0.3;Resolution: 0.1;Measuring range: 0-360 The body of the ruler is forged from high quality stainless steel, which ensures the quality, corrosion resistance and durability. durability. Excellent Quality - The high quality forged stainless steel electronic protractor is laser engraved (scale e n mm and inches), abrasion and corrosion resistant. The analog protractor on the protractor does not lose color during use, and the scale remains clear even after a long time.