Bosch Professional GRL 400 H Self-Levelling Rotary Laser Set, 400 m Range, IP56

The Bosch Professional GRL 400 H Rotary Laser Set with BT170 Tripod and GR240 Measuring Rod is a rotary laser for professional outdoor levelling, grading, and alignment work. It projects a red rotating laser reference plane at 600 RPM with a working range of up to 400 m when used with a receiver. Electronic self-levelling automatically compensates for alignment deviations within a ±5° range, achieving a levelling accuracy of 0.08 mm/m. This range and precision suit the unit for excavation level checks, foundation setting, concrete formwork alignment, and landscaping layout. An integrated ADS shock-warning system alerts the operator if movement or impact disturbs the levelling reference during operation.

The IP56-rated housing provides protection against dust and water ingress for use in demanding outdoor conditions. Power comes from two included LR20 (D) NiMH batteries, delivering up to 30 hours of operating time per set. A one-button interface limits operation to single-button inputs, removing the need for menu navigation. The set ships complete with a BT170 tripod featuring a standard 5/8-inch thread and a GR240 measuring rod, providing a ready-to-deploy levelling solution. No onboard display is fitted; range confirmation at distance depends on a separate receiver. Housing dimensions of 180 x 190 x 170 mm and a weight of 1,800 g keep the laser manageable for transport between work areas.

• Laser class 2 with 635 nm wavelength – visible red beam classified for construction environments
• 15-second automatic levelling cycle – ready to measure shortly after placement
• Horizontal beam direction with 360° rotation – full-site reference from a single setup position
• 1.2 V NiMH battery technology – rechargeable cordless power for remote site use
• Rotary horizontal levelling and alignment mode – single-function operation for grading and layout tasks