Features:This distance finder adopted laser technology with precision induction, accurately and efficiently measures the distance.It can measure distances in a straight-line from 1.5 Feet to 60 Feet or 0.5m to 18m Area. Multi-function: Area and volume calculation function, continuous measurement function, addition and subtraction.The instrument can be widely used in building and industry, especially in the building process of room, apartment, factories and other large area.The measured distance is determined by transmitting ultrasonic waves to the object to be measured and then calculating the ultrasonic round trip time.Specification:Item Type: Range FinderMeasuring range: 0.5m to 18mMaximum measuring distance: 18 metersThe sum of the maximum distances: 180.00 metersMaximum calculation volume: 1800.0 cubic metersBattery type: 1 x 9V Battery(not included)Resolution: 0.01 metersOperating frequency: 40kHzOperating temperature: 0-50 Weight: Approx. 105gPackage List:1 * Range Finder 1 * User Manual