Using optical lens, international high quality laser head components, accurate measurement, fast speed, low power consumption and long service life.Accurately measure millimeter quantification and observe while measuring with a measuring instrument to ensure millimeter measurement accuracyThe laser module's standard class 2 laser is reliable and environmentally friendly, stable, professional optical system used indoors and outdoors, and built-in intelligent optical compensation system to meet various measurement needs.Humanized intimate design, humanized design, universal Android mobile phone data cable, you can charge anytime, anywhere.Support USB charging, fast charging, support power bank / computer / car USB chargingWhen measuring distance, keep the bubble water drop horizontal in the middle to ensure that the rangefinder is level with the ground, so that the measurement is more accurate. Nine keys are more convenient to use, 9 keys one key one function, easy to understand and more convenient. Waterproof body, drop and shock resistance The whole machine is made of high-strength ABS engineering plastic, which is not fragile when dropped from a high place. The buttons are made of soft silica gel, which makes it look great. Product parameters:Specification model: H-40Measuring range: 0.03-40Measurement Accuracy: 1, OMMMinimum display: 1MMSingle measurement time: 0.1-4 secondsUnit of measurement: M meter) / FT (feet) / IN (inches)Laser quality: 635NMLaser Type: 1 MWLaser power: supportContinuous distance measurement: supportArea measurement: supportVolume measurement: supportPythagorean measurement: supportArea volume Pythagoras measures more or less: supportMaximum and minimum measurement: supportData storage: 20 groups maximumMeasurement reference switching: supportDisplay illumination: supportBuzzer: supportBattery life: 15000 measurements can be taken Dust/Water Splash: IP54Operating Temperature: 0-40Storage temperature: -20-60Automatically turn off the laser: 60 secondsAuto power off: 480 secondsSpecification: 12OMM*53' 39MM