Features: Compact structure and light weight, portable to use and carry around. Easy to operate, just put it on the slope, support both absolute and relative measurements. The content of the large display screen can be automatically flipped to facilitate reading. LM320B inclinometer supports dual-side laser measurement to obtain more accurate measuring results. Magnetic on both sides (LM320A) / magnetic on four sides (LM320B), so that it can be attracted on the metal surface to obtain accuracy results. Powered by a 3.7V 300mAh lithium battery and featuring low battery indicator, support recharging through the equipped USB cable with Type-C interface. If there is no operation within 5 minutes, it will automatically shut off to save power. Widely applicable to automobile, railway, military, industry, machinery, woodworking, construction, telecommunications, etc. Specifications: Model: LM320A / LM320B (Optional) Magnetic Base: magnetic on both sides (LM320A) / magnetic on four sides (LM320B) (Optional) Material: Aluminium alloy Color: Black Power Supply: 1 3.7V 300mAh lithium battery Charging Interface: USB Type-C Working Time: about 2 hours Measuring Range: 490anddeg; Accuracy: andplusmn;(0.2anddeg;) Resolution: 0.01anddeg; Relative / Absolute Angle Measurement: andradic; Angle Locking Function: andradic; Low Battery Reminder: andradic; User Interface: reverse display screen with backlight Automatic Shutdown: no operation within 5 minutes Bidirectional Laser Scanning: only LM320B support LM320B Wavelength: 630nm-670nm LM320B Laser Radiation: CW1mW Operating Temperature: 0-50 Item Size: Approx. 6.26.23.2cm / 2.442.441.26in Item Weight: Approx. LM320A: 97g / 3.42oz LM320B: 123g / 4.34oz Package Size: Approx. 117.54.5cm / 4.332.951.77in Package Weight: Approx. LM320A: 182g / 6.42oz LM320B: 209g / 7.37oz Packing List: 1 Inclinometer 1 Reflecting Board 1 Silicone Pad 1 USB Cable 1 User Manual (English)