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. Large 1 LCD Display - This metal protractor with electronic LCD digital display, you can switch between degree and minute 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 accuracy - 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 quality, corrosion resistance and durability. Excellent quality - High quality forged stainless steel electronic protractor is laser engraved (mm and inch scale) , resistant to abrasion and corrosion. The analog protractor on the protractor does not lose color during use, and the scale remains clear even after a long time.