Ruler made of stainless steel for durability, Could be well used into various fields besides of Angle ruler, Straight ruler and Square Ruler. For variable, precise measurement and transfer of angles from 0-360°. With LCD display for reading measurements easily, Total length 400mm. Can be reset to zero in any position, Ruler with mm / inch scale. Includes battery / includes instructions for use. Display reads continuously as arms are adjusted Hold function so you never forget a measurement Takes both inside and outside angle measurements Large clear LCD display Strong blade lock holds securely for transfer of measurements Reversible reading that allows you to flip the display reading to right side up Measure range: 0-360 degrees Powers off after 5 minutes of non use Resolution: 0.05 degree (that’s 5/100th of a degree ) Accuracy: +/- 0.2 degree Repeatability: 0.05 degree Battery: 3V CR2032 with life of approximately 1 year