Digital Goniometer] A digital goniometer perforated for hanging a digital angle level, designed for industrial applications that involve setting precise angles, such as alcoves and cabins, sloping roofs and handrails (note : it is not a digital level). Backlit LCD DisplayBacklit LED display, can read data clearly even in low light conditions. High Precision Measuring accuracy 0.5, increase/decrease angle: 0.1, angle range 0-225, allowing you to measure with precision the angle horizontally and vertically. Mechanical lockThere is a LOCK button to keep the angle unchanged during the line process, and a HOLD button to lock angle. Auto Power Off It is powered by a 9-volt battery, which is included, and automatically turns off after 5 minutes of inactivity to extend the battery life. WARNING: Do not move screws and components randomly. Handle your angle indicator with care ;caution, use steady force to rotate the rotating arm and do not use too much force. Do not let the rotating arm ;backlight open too long. When the low power alarm icon appears on the screen, the screen, please change the batteries. Sold by the Bianco FR store