This is a very well built, versatile, accurate and labor intensive digital laser distance meter. It greatly improves speed and accuracy, makes field work easy, mindless and more accuracy. The measuring origin can be set to the front, back or middle. Simple measuring is very easy: just press the MEAS key once to turn on the laser; point it to where you want to measure and press the MEAS key again. The distance can be displayed in inches/feet (both decimal and fractional) or meters. You can cycle through the various units by pressing the UNIT key. Other options include area, cubic volume, indirect measurement, the ability to add/subtract measurements...etc. The meter has Large TFT LCD 4 lines Display, digital Level, Camera, USB Connection, Self Calibration function, Area & Volume Addition/Subtraction, Straking-out. Specification: Measuring Range 0.05-80m Measuring Accuracy ¡À2mm Measuring Unit mm/in/ft Continuous Measurement YES Area Measurement YES Volume Measurement YES Triangle leg Measurement YES LCD TFT Addition/Subtraction YES Area&Volume Addition/Subtraction YES Max./Min. Measurement YES Straking-out YES Delay Measurement YES Digital Level YES Camera YES Max storage 100 Units Connection USB Laser Class 635nm Class 2 Automatic laser off 20s Automatic shutdown 150s Storage Temperature -2060 degree Celsius Operating Temperature 0 40 degree Celsius Storage Humidity RH85% Battery 3x1.2V 1000mA Ni-MH Size 125x50x26.5mm Weight 155g with battery Package List Laser distance meter: 1 pc Pounch: 1 pc Hand strap: 1 pc Rechargable Battery: 3 pc Charger: 1 pc USB Connector: 1 pc User' s manual: 1 pc Giftbox: 1 pc.