FEATURES: Self leveling 3 beam laser; accurate to +/-0.2mm/m, Self leveling up to 4 degrees surface angle, One button operation ? fast and easy operation of laser, Pendulum locks when in off position, Focused laser beam keeps dot small; even over long distances for improved accuracy and visibility, Location magnets allow pointer to be used on metal track or with wall bracket, Industrial design allows pointer to be placed over track, Pointer can be rotated 180 degrees. SPECIFICATIONS: Laser class: 2; <1mW, Levelling Accuracy: +/-0.2 mm/m, Self-levelling range: +/- 4 ?, Number of beams: 3, Direction of beams: up/down/level, Indoor Visibility Range: 30 m, Power Source: 6V ? 4 x AA Alkaline batteries, Tripod connection: 1/4? (6.35mm), Weight (incl. battery): 0.55 g, Width: 55 mm, Length: 135 mm, Height: 100 mm