4 in 1 Digital Protractor - Can not only measure length, but also 360 angle (inside angle, outside angle). Locking function Use locking screws to lock the two feet in the position or the angle desired. LARGE 1" LCD DISPLAY - This metal protractor features an electronic LCD digital display, you can switch between degrees and minutes with the "/" button short press any angle; angle lock knob for every angle. Length, width and precision - Length measurement: 300 mm; Measuring angle: 000.0~999.9; Precision ; 0.3; Resolution: 0.1; Measuring range: 0-360. The body of the ruler is forged from high quality stainless steel, which guarantees quality, corrosion resistance and durability. PREMIUM QUALITY - High quality forged stainless steel electronic protractor is laser engraved (mm and inch scales), abrasion and corrosion resistant. The analog protractor on the protractor does not fade during use and the scale is still clear after a long time.