High Precision Digital Level Ruler with 4 measuring modes: degrees, inches/feet step, millimeters/meters, and slope percentage. Offers high accuracy of 0.1 at 0 and 90, and 0.2 from 1 to 89. Resolution is 0.01 at 0 and 90, and 0.05 at other angles. Features a large, clear LED display with automatic switching for easy reading in low-light conditions. Includes an audio indicator to assist in determining horizontal or vertical alignment. Equipped with a magnetic V-groove base for secure attachment to ferrous metal surfaces such as pipes, steel frames, and metal structures. Constructed with a durable I-beam aluminum frame, neodymium magnets, rubber end caps, and dust/splash resistance for reliable performance in demanding environments. Includes HOLD function to capture and transfer measurements to other locations, and ZERO function to reset the reference point at any time for both absolute and relative measurements. Designed for two-axis measurement use. If the third axis tilt exceeds 30 degrees, the display will show an "Err" message. A low battery icon indicates when battery replacement is needed.