2 in 1 Digital Protractor - Measure not only length, but also 360 angle (inside angle, outside 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 & 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. Multi-function This angle finder ruler can measure both angle and length, in both metric and imperial scale. Woodworking: setting angles for table saw, miter saw, band saw, etc. Construction Sketching, drawing Convenience Quickly measure angles with an accuracy of 0.3 degrees. (0.3 degree means the measurement result may be higher or lower than the actual angle by 0.3 degree maximum. The total difference between two measurements can be up to 0.6 degree). Easy operation with only two buttons. A good locking function can lock the measurement at any angle. Compact structure for convenient carrying and use. Accessibility The rulers of this digital angle finder are made of durable brushed stainless steel. The angle finder can be used in various fields instead of an angle ruler, straight ruler or square ruler, etc. Easily draw lines with the stainless steel rulers. Stainless Steel Angle Ruler Technical Description and Operation Measuring Range: 0~999.9 (must be calibrated before each use) Resolution: 0.1 Folded length: 220 mm Accuracy: 0.3 ( 0.3 degrees means that the measurement result can be up to 0.3 degrees higher or lower than the actual angle. The total difference between two measurements can be up to 0.6 degrees). Extended length: La diffrence totale entre deux mesures peut aller jusqu' 0,6 degr). Longueur allonge : 400 mm Ruler measuring range: 0~400 mm; 0~7 inches Measurement: laser engraving Working temperature: 0~50C. The set includes: Stainless steel protracor * 1, instruction * 1, CR2032 battery * 1, transparent insert * 1. Battery: CR2032 3V lithium battery