Usage Tips:High precision measurement: provides ultra-accurate readings with full coverage of 4×90°, 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 and specificationsColor: blackModel: 4-sided magneticAccuracy: ± 0.2 °Dimensions: 60 × 60 × 30 mmPackage contents: 1 × 4 sides magnetic digital inclinometerFunction: Conversion of angles and slopes, relative measurement, absolute measurement, arbitrary position reset, automatic shutdown after 3 minutes, data locking, lithium battery direct charging. szbym02