200mm digital protractor inclinometer goniometer level measuring tool electronic angle gauge stainless steel angle ruler

reading value: 0.05°, accuracy error: plus or minus 0.3° 1. professionally measure the inner and outer angles and angles of objects 2, angle and ruler combined 2 is 1; 3, 0-360 ° complete measurement; 4, with a locking knob to facilitate the locking angle at any position; 5, stainless steel material, not easy to rust. 6, pull the boot; 7, power: 3v (cr2032 × 1), the product does not have a battery 8, button function: open / key clear key, data hold button, degree conversion button