High precision measurement: provides ultra-accurate readings with full coverage of 4andtimes 90anddeg , making it easy to measure absolute or relative angles and inclinations in any situation. display: equipped with a large, clear LED display for real-time data visibility, even in daylight - improves efficiency of indoor and outdoor work, regardless of light conditions. Powerful magnetic BASE: magnetic design on all four sides for a solid attachment to metal surfaces - allows totally hands-free use and multi-angle alignment without slipping or moving. USB RECHARGEABLE and auto shut-off: built-in RECHARGEABLE battery with USB charge - includes data hold function and auto shut-off after three minutes to extend battery life and facilitate on-site use. Strong and easy to use design: rugged outer shell resistant to impact and daily wear - simple operation with intuitive buttons: short press to turn on, long press to turn off, and ZERO button to reset the Angle. Specifications Color: black Model: 4-sided magnetic Accuracy: andplusmn 0.2 anddeg Dimensions: 60 andtimes 60 andtimes 30 mm Package contents: 1 andtimes 4 sides magnetic digital inclinometer Function: Conversion of angles and slopes, relative measurement, absolute measurement, arbitrary position reset, automatic shutdown after 3 minutes, data locking, lithium battery direct charging.