Core functions:ANENG B80 Laser Rangefinders 80m Digital Ruler Test Tools High Precision Laser Distance Meter Ruler Distance Measuring TapeLow battery reminderData retentionHorizontal bubbleaddition and subtractionBacklit display0.5s fast and accurate measurementFeatures:User-friendly slippery-resistant texture design.Designed with bubble level, making measurement more accurate.LCD backlight screen, reading is more clear and bright;Dustproof and waterproof level;Stable and reliable measurement.ANENG 80M Laser Rangefinder B80 Range Finder Laser Measure Distance Meter Digital Construction Level Measuring Tools Model B80 Range of measurement 0.05-80m Measurement accuracy 1.5mm Measurement basis selection Pre-basis/post basis Measurement unit selection m/inch/feet Area and volume calculation method Yes Pythagorean theorem calculation method Yes Height difference Yes Addition/subtraction function Yes Continuous measurement Yes Storage of historical data Yes Buzzer Yes Battery type 2x1.5V AAA(not inclued) Battery life 10.000 Laser cla Cla II Dustproof and waterproof cla Ordinary civil cla Operating temperature 0 to 40 Storage temperature -25 to 70 Package Includes:(not with battery)1 x Laser Distance Meter