The Bosch GRL 400 H Professional Rotation Laser is easy to use and ready to go. Always prepared for use at a moments notice when performing outdoor-levelling applications. Its one-button keypad, Electronic Self Levelling functionality, and convenient battery tray enable straightforward work with an easy setup and simple battery replacement, without even moving the tool. With an accuracy of +- 2.4mm at 30m and an ADS shock warning system that indicates if the tool's position has changed, the GRL 400 H prevents levelling errors and delivers consistently accurate results. From determining cut and fill values for excavation and footings, to levelling concrete forms and landscaping, this tool does an excellent job. This rotary laser is prepared to withstand the harsh conditions of any outdoor job site thanks to its water and dust protection IP56. Supplied with: 2 x D 1.5V LR20 Batteries. 1 x Non-rechargeable Battery Compartment. 1 x LR 1 Professional Laser Receiver. 1 x 9V Block Battery (6LR61) 1 x Carrying Case. Specifications: Accuracy: +- 2.4mm at 30m* (*plus use-dependent deviation) Self-levelling Range: +- 8% (+- 5°) Working Range: 20m. Working Range with Receiver: 400m. Levelling Time: 15 sec. 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.