Technical Specifications Working Range: 15 m Levelling Accuracy: ±0.5 mm/m Self-Levelling Range: ±4° Laser Class: Class 2 Laser Wavelength: 635 nm Laser Output: <1 mW Laser Colour: Red Projection: 3 laser lines Power Supply: 4 × 1.5 V AA batteries Weight: Approx. 0.5 kg Tripod Thread: 1/4' Power Source: Battery Self-Levelling: Yes Bosch's current India product page confirms the 15 m range, ±0.5 mm/m accuracy, ±4° self-levelling range, Class 2 laser and 4 × AA battery supply. Description Line Laser Bosch GLL 3 X Professional is a compact and robust 3-line laser level designed for accurate horizontal and vertical alignment. It provides a 15 m working range and ±0.5 mm/m levelling accuracy, with automatic self-levelling up to ±4°. Its visible red laser lines make alignment work quick and easy for professional users. Ideal for: Tile installation, drywall work, window installation, interior fitting, mounting shelves and sockets, levelling, alignment and general construction applications.