FEATURES: Self-levelling cross line laser is accurate to ?0.3 mm/m in levelling applications, Self-Levelling up to 4 degrees surface angle with automatic out of level indication; marks a levelled line in seconds, 2 button operation and low battery indication for ease of use, Built in magnetic pivot bracket mounts easily on metal surfaces, Over molded housing and thick glass protects the tool and helps maintain calibration under jobsite conditions, Includes 3 x AA batteries for 40 plus hours runtime, Kit box protects unit and helps maintain calibration when stored in gang box, Works with DE0892 detector up to the distance of 50 meters. SPECIFICATIONS: Laser class: 2; <1mW, Levelling Accuracy: +/-0.3 mm/m, Number of beams: 2, Direction of beams: vertical/level, Indoor Visibility Range: 10 m, Self-Levelling Range: +/-4 ?, Power Supply: 4.5V ? 3x AA, Tripod connection: 1.4?, Width: 61 mm, Length: 112 mm, Height: 113 mm