High precision: precision less than 2mm; 3 m\/in\/ft units and 2 reference points, faster and more accurate than a tape measure. 5 measurement modes: single and continuous distances (min\/max), area, volume, Pythagoras for height and triangular area. Durable tool: The product is made of high strength ABS plastic with IP54 waterproof and dustproof grade, widely used in home, construction and industries. Read clearly: backlight display and support data clear function; Compact size and lightweight, you can put it in your pocket after use. Measuring scope: 40 meters Measurement accuracy: +\/- 2mm Unit of measurement: m\/in\/ft Measurement time: 0.1 to 3 seconds Laser class: class II Laser type: 635nm andlt; 1mw Dustproof and waterproof: IP54 Automatic laser shutdown: 60 seconds Auto shut-off: 480 seconds