describe: 360-degree measurement slope angle range, no dead ends. 4 Built-in powerful magnets with strong adsorption force free your hands and record readings easily. Comes with 3 separate vials for easy leveling: horizontal, vertical and 45 degrees, and a large, clear LCD with backlight for easy reading. The digital inclinometer protractor features a data hold feature that locks readings at any angle and always maintains an upright display even when the protractor is put down. Place it on the zero position of the reference surface to measure the relative angle. Through absolute angle measurement, you can test whether the working surface is level. The digital magnetic protractor will automatically shut down if there is no operation for about 3 minutes, which is very power-saving. Compact and lightweight, has 2 holes for easy hanging and carrying. It is widely used in many fields such as machinery manufacturing, construction, vehicle maintenance, physical therapy equipment maintenance, wood processing, indoor and outdoor decoration, etc. Specification: Dimensions: 286x59x20mm/11.3x2.3x0.8 inches Resolution: 0.05 Accuracy: 0.1 Range: 4×90 Power supply: 2 AAA batteries (not included) Model: HW-200 Features: LTD backlight automatically turns off Functions: Invert display, hold locked, ruler Application fields: machinery manufacturing, construction, communication installation, home decoration, etc. Package Contents: 1 x horizontal inclinometer 1 manual notes: Please allow slight 0-1cm differences due to manual measurement. Color may vary depending on lighting and how listing is viewed. Thank you for your understanding and attention. I wish you a pleasant shopping experience