Technical Specifications Working Range: 60 m Working Range with Receiver: 350 m diameter Levelling Accuracy: ±1.5 mm at 30 m horizontal / ±3.0 mm at 30 m vertical Self-Levelling Range: ±5° (8%) Levelling Time: 30 seconds Rotation Speed: 0 / 150 / 300 / 600 RPM Laser Colour: Red Laser Class: 3R Laser Wavelength: 630–650 nm Power Supply: 2 × 1.5 V LR20 (D) batteries Operating Time: Up to 30 hours Tripod Thread: 5/8' Protection: IP56 Weight: Approx. 1.8 kg Operating Temperature: −10°C to +50°C Manual Slope Range: ±8% Scan Angles: 10° / 25° / 50° Bosch confirms these specifications for the GRL 350 HV Professional. Description Rotation Laser Bosch GRL 350 HV Professional is a robust professional rotary laser designed for horizontal and vertical levelling applications. It provides a 60 m working range, which extends up to 350 m in diameter when used with the LR 30 laser receiver. The tool offers variable rotation speeds of up to 600 RPM and manual dual-slope adjustment of up to ±8% for demanding construction applications. Its IP56 protection, shock-warning function and durable construction make it suitable for tough jobsites. Ideal for: Concrete work, foundation levelling, grading, landscaping, suspended ceilings, drainage installation, site preparation and general construction alignment.