Feature: Instant measurement of distance, area & volume with one button operation: YES Wide measuring range: YES Automatic calculation of Area and Volume: YES Indirect measurement by Pythagorean Theorem: YES Single/Continous measurement: YES Max/Min distance tracking (display value): YES Easy Addition/ Subtraction of measurement: YES Set up front / rear benchmark: YES Selectable meter(m), inch(in) and feet(ft): YES Data store/ recall function: YES Data Hold / Data clear function: YES Air Bubble Level: YES, Included Easy targeting with bright laser pointer: YES Large LCD with backlight and multi-line display (4 lines): YES Auto correction and error report technology: YES Buzzer indication: YES Battery status Indication: YES IP54 protection (dust & splash proof): YES Auto / Manual power off function: YES Multifunction with intelligent calculation: YES Compact & handy design: YES CE, ROHS, FCC certificate: YES Specifications: Measuring range:40m (131ft) Acurracy:+/-2mm (0.079inch) Laser class: Class II Laser maximum output: <1Mw Dust & Splash proof: IP 54 Laser Auto off: 20S Power Auto off: 150S Operation temperature: 0~40℃(32~104F) Storage temperature: -20~60℃ (14~140F) Power supply:2 x 1.5V AAA battery（Not include） Dimension: 112*50*25mm (4.41 x 1.97 x 0.99inch) Weight: approx 250g Package Content: 1 * Laser Distance Meter SW-T40 1 * Portable pouch 1 * Hanging rope 1 * User manual 1 * Retail box