General description The Bosch GRL 400 H Professional Rotation Laser is designed for easy use and is always ready for outdoor levelling applications. Featuring a one-button keypad and Electronic Self Levelling functionality, it allows for straightforward operation and simple battery replacement without moving the tool. With an accuracy of ± 2.4mm at 30m and an ADS shock warning system, it prevents levelling errors and ensures consistent results. This rotary laser is built to withstand harsh outdoor conditions, thanks to its IP56 water and dust protection. Technical specifications Accuracy: ± 2.4mm at 30m Self-levelling Range: ± 8% (± 5°) Working Range: 20m; Working Range with Receiver: 400m Levelling Time: 15 seconds Laser Diode: 635 nm, < 1 mW Laser Class: 2 Operating Temperature: -10 – 50°C Storage Temperature: -20 – 70°C Dust and Splash Protection: IP56 Power Supply: 2 x D 1.5V LR20 Batteries (Supplied) Tripod Thread: 5/8in-11 Weight: 2kg Rotation Speed: 600 rpm Operating Time Max: