1. Professionally measure the inner and outer angles and angles of objects 2.0-360 ° complete measurement. 3.Easy to lock at any angle, compact, accurate measurement, easy to read. 4. With a locking knob, convenient to lock the angle at any position. 5. 5 minutes automatically shut down, induction automatically boot. 6.Button function: open / key, clear key, data hold button, degree and degree conversion button Material:Carbon fiber + ABS Size:about 220mm; Measuring range: 0-360 ° Resolution: 0.1 ° Accuracy: ± 0.3 ° Working power: 3V Battery model:1*CR2032(included) Operation time: 5,000 hours Operating temperature: 0 °C - +50 °C Working humidity: ≤85% Automatic closed screen time: 6min Usages: Measurement of angle and length Packing includes: 1* 2-in-1 Digital Angle Ruler. 【Accurate Data】 The digital angle ensure the accuracy of data up to ±0.3°. Hinge mechanism on the angle rule allows a full range of 0 to 360-degrees to measure inside outside and reverse angles. 【Simple & Easy Used】 The Angle Finder Tool both measure the angle and length, metric and inch display. Calculating quickly and accurately, avoid tedious calculations, never guess or eye ball the angle and length again with one convenient tool. 【Humanized Detail Design】 Short and light, one hand can be operated, easy to carry. Specially treated matte stainless steel ruler body: The ruler body does not reflect light, each Angle can be clear reading Bigger and bolder type of the ruler: Sharper reading. 【Durable & Long Battery Life】 This digital protractor has been adopted high quality stainless steel ensures the durability of the product. Large capacity standby with automatic power-off function can work more than 2000 hours, saving power consumption and extending battery life. 【Note & Warranty】 Stainless steel edge is compatible with sharp, please be cautious while using AND KEEP IT AWAY FROM CHILDREN.