Digital Goniometer Digital goniometer with hole for hanging a digital angle level, designed for industrial applications where precise angle adjustment is required, such as niches and cabins, sloping roofs and handrails (Note: This is not a digital level). Backlit LCD Screen LED backlit screen, can read data clearly even in low light conditions. High precision Measuring accuracy 0.5, increase/decrease angle: 0.1, the angle range includes 0-225, allowing you to accurately measure the horizontal and vertical of the angle. Mechanical lock There is a LOCK button to keep the angle unchanged during the line process, and a HOLD button to lock the angle. Auto Power Off Powered by the included 9V battery, it can automatically turn off after 5 minutes of inactivity to extend battery life.