Work Principal: Photoelectric (It will not shake while take measurement); Wide measuring range: 0.05~60m (0.16 to 197ft); High accuracy; Compact & handy design; Easy operation; Fast measurement; Distance measurement; Area measurement; Volume measurement; Indirect measurement by Pythagorean Theorem; Length Plus / Minus; Single / continuous measurement; Max/Min distance tracking (display value instant) under continuous measurement; Tilt measurement (angle measurement); Tile measurement ON/OFF; Set up benchmark; Data store/ recall function-10data; Selectable meter(m) inch(in) feet(ft) feet(ft) / Inch (in) can be switched at all circumstance except stored data; Data hold / data clear function; Beep indication ON/OFF; Easy targeting with bright laser pointer; Large LCD with backlight and multi-line display (4 lines); Auto correction and error report technology; smart signal compensation; Low battery indication; IP54 protection (dust & splash water proof); Auto / manual power off function; Acurracy: 2mm (0.079inch); Resolution: 1mm; Laser class: Class II; Laser wavelength: 620~690nm; Laser maximum output: <1mW; Dust & Splash water proof: IP 54; Laser switch off automatically: after 30 seconds; Power switch off automatically: after 3 minutes; Power supply: 2 x 1.5V AAA batteries (We'll have to take away the batteries due to 11-Shipping company's policy); Battery life: 5000 ~ 8000 measurement; Weight: 85g; Dimension: 113 x 45 x 25mm