【High Precision Digital Level Ruler】4 measurement modes: measurement degree, IN/FT step, mm/M and slope percentage. High precision: the accuracy is ±0.1° at 0° and 90°, and the accuracy is ±0.2° at 1-89°. Resolution: ±0.01° at 0° and 90°, ±0.05° at any other angle. 【Large Clear LED Display with Audio Indication】The digital magnetic spirit level has a large, bright LED display that can switch automatically, so you can easily read the measurement results even in the darkest room. In addition, we can also use the audio indication to determine whether the horizontal ruler is in a horizontal or vertical position. 【Magnetic V-Groove Base】The magnetic V-groove base is firmly attached to ferrous metal surfaces such as pipes, tubes, steel frames and metal processing. Sturdy I-steel aluminum frame, neodymium magnets, rubber tips and dust/splash protection, suitable for harsh working environments. 【HOLD and ZERO Function】HOLD function: The HOLD button can transfer the value target value to other