General description The Bosch GRL 400 H Professional Rotation Laser is designed for easy outdoor use, featuring a one-button operation and a self-explanatory display. It offers self-levelling capabilities of ± 8% (± 5°) in horizontal mode and includes an automatic shock warning function to prevent levelling errors caused by vibrations or shocks. This rotary laser is ideal for various applications, including excavation, footings, concrete levelling, and landscaping. Technical specifications Working range without receiver: 20 m Working range with receiver: 400 m (Diameter) Accuracy: ± 0.08 mm/m Laser diode: 635 nm, < 1 mW Operating temperature: -10 to 50°C Storage temperature: -20 to 70°C Levelling time: 15 seconds Dust and splash protection: IP56 Rotation speed: 600 rpm Power supply: 2 x 1.5 V LR20 (D) batteries (supplied) Weight: 2 kg Tripod thread: 5/8"-11 Overall height: 183 mm Overall width: 188 mm Compatibility and accessories Compatible laser receiver: LR 1 Included accessories: