DIY Laser two beam - GP - 116

* Magnetic automatic levelling ensures more quick self-levelling. * When the instrument inclines over ±3°, the line laser gleams and makes an alarm. * Built-in locking system can lock the compensator automatically when turning off the power. Beam: 1V1H Light sources: 635 nm laser diode Laser safety class: Class 2 Accuracy: ±1.5mm / 5m Self-levelling range: ±2° Working range: Radius 10~15m Power supply: 2 x AA alkaline batteries/ rechargeable batteries Mounting thread: 5/8"X11,ISO standard Range of operating temperature: -10°C~+40°C Instrument size: 50mm x 90mm x 140mm Instrument weight: 0.49kg (including batteries)