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.