2 in 1 Digital Protractor - Measure not only length, but also 360° angle (inner angle, outer angle). Locking Function Use locking screws to lock both legs in the desired position or angle. 1" Large LCD Display - LCD with electronic digital display, you can switch between degrees and minutes with the "°/" button. "HOLD" button stores data during measurement, "ON/OFF/Zero" button resets data to zero by short pressing at any angle; Angle lock button for each angle. Length, Width and Accuracy - Length measurement: 400mm; Measuring angle: 000.0°~999.9°; Accuracy; ±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 premium stainless steel forged scale is laser engraved (mm and inch scale), abrasion and corrosion resistant. High Quality Service - If you have any questions about the use, installation and product, you can contact customer service.