Screen size: 46 x 25 mm Product color: multi-color optional Product size: 61 35 54 mm Building construction: assistance in building construction, laying house floors, installing doors and windows, vertical and horizontal calibration Interior decoration: placement of furniture and household appliances, installation of closets, decorations, kitchen and toilets, etc. Machinery Manufacturing: Mechanical workbench, Miter saw blade angle adjustment Woodworking: Precise cutting of furniture wood corners Experimental teaching: The precise rules of angles used in science and engineering laboratories of colleges and universities Electronic communication: Radar antenna angle alignment, satellite antenna, TV receiver elevation angle measurement 7. Auto repair: Four-wheel alignment, vehicle leveling, precise control of tire mounting angle, etc. Others: Military industry, medicine, astronomy, aerospace and other fields requiring angle measurement and angle control Energy-saving - With AAA battery (not included) Delivery quantity: 1 piece 1 pice