Features: Designed with versatile functions and especially for needs of high-precision distance measurements. Lightweight, simple, instant, reliable to measure, a tool that get your work done significantly easier. Remarkable accuracy and fast measurement; Laser intensity indication. Innovative and ergonomic structure design. Smarter volume and area calculations based on measured length, width and height. Widely used in household construction, decoration, transportation, fire fighting, gardening, city planning, city appearance management, water project monitoring, electric power maintenance etc. A perfect substitute of traditional measurement tools(tape, ruler), your best assistant of measurement. Specifications: Brand UNI-T Model(Optional) UT390B+ UT392B Accuracy (m) ±(1.5mm+d*5/100000) Measuring Distance (m) 40m 100m Unit M/in/ft Laser Class 635nm,＜1mW, Class2(II) Continuous Measurement Yes Yes Area/Volume Calculation Yes Yes Pythagoras Theorem Calculation Yes Yes Add/Subtract Yes Yes Length Add/Subtract Yes Yes Area Add/Subtract Volume Add/Subtract Yes Yes MAX/MIN Yes Yes Automatic calibration Yes Yes Data Storage 30 30 Battery life 8000times of measurement Auto laser off Yes Yes Buzzer Indication Yes Yes Battery Level Indicator Yes Yes Leveling instrument Yes Yes Auto Power Off Yes Yes Storage Temperature -20℃~60℃ Battery Type AAA battery (NOT included) Size 11.2*5*2.5cm/4.4*2*1in Weight 233g(approx.) Package Includes: 1 x Range Finder (batteries are NOT included) 1、Designed with versatile functions and especially for needs of high-precision distance measurements 2、Lightweight, simple, instant, reliable to measure, a tool that get your work done significantly easier 3、Remarkable accuracy and fast measurement; Laser intensity indication 4、Innovative and ergonomic structure design 5、Smarter volume and area calculations based on measured length, width and height