4 in 1 Digital Protractor - Measure not only length, but also 360° angle (i.e. inside angle, outside angle). Locking Function Use locking screws to lock both legs in the desired position or angle. Large 1 inch LCD display - This metal angle meter with LCD electronic digital display, you can switch between degree and minute with the "°/" button. “HOLD” button saves data during measurement, “ON/OFF/ZERO” button resets data to zero by short pressing at any angle; angle lock button for every angle. Longer, wider and more accurate - Length measurement: 400mm; Measuring angle range: 000.0°~999.9°; exactness; ±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 - The electronically forged stainless steel angle gauge from high quality, the scale is laser engraved (mm and inch scale), abrasion and corrosion resistant. The analog protractor on the protractor does not lose color when used, and the scale remains clear even after a long time.