Work Principal: Photoelectric (It will not shake while take measurement) -Wide measuring range: 0.05 to 100m (0.16 to 328ft) -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 -Multi-benchmark set up: Front / Rear / Extended edge-For measurements from a corner -Timer set up -Data store/ recall function: 20 data equipped with a tripod interface -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 Specifications: -Measuring range: 0.05~100m (0.16 to 328ft) accuracy: 2mm (0.079inch) -Resolution: 1mm -Laser class: Class II -Laser wavelength: 620~690nm -Laser maximum output: <1mW -Dust & Splash waterproof: IP54 -Laser switch off automatically: after 30 seconds -Power switch off automatically: after 3 minutes -Power supply: 2 x 1.5V AA batteries (not included due to -Shipping company's policy) -Battery life: 5000~8000 measurement -Weight: 150g -Dimension: 118 x 49 x 27mm