Product Overview: Easy to use and ready to go – the intuitive, single-button GRL 400 H rotary laser is always prepared for use at a moment´s 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 ± 2.4 mm 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. Includes: Laser Receiver LR 1 Professional (0 601 015 400) Bracket (1 608 M00 70F) Non-rechargeable battery compartment (1 609 203 M02) 2 x 1.5 V LR20 battery (D) 1 x 9 V block battery (6LR61) Carrying case