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 Finder Measuring range: 0.5m to 18m Maximum measuring distance: 18 meters The sum of the maximum distances: 180.00 meters Maximum calculation volume: 1800.0 cubic meters Battery type: 1 x 9V Battery(not included) Resolution: 0.01 meters Operating frequency: 40kHz Operating temperature: 0℃-50℃ Weight: Approx. 105g Package List: 1 * Range Finder 1 * User Manual