Features:This distance meter adopted ultrasonic technology with precision induction, accurately and efficiently meters the distance.High precision ultrasonic range finder can be used to measure distance, area and volume.Less error and strong anti-interference ability.Compact size and light weight, convenient to carry.The measured distance is determined by transmitting ultrasonic waves to the object to be measured and then calculating the ultrasonic round trip time.Widely used in building and industry, especially in the building process of room, apartment, factories and other large area.Specification:Model: CP-3008Weight: 134g/4.7ozMeasuring range: 0.50 ~ 18.288mAccuracy: 0.005+1Battery: 9V (NOT included)Transmission frequency: 40KHzWorking temperature: 0~ 50Package List:1 x Ultrasonic Range FinderNote: 1. The ultrasonic rangefinder measures the distance from the bottom of the machine rather than the top of the obstacle.2. Try to keep the measuring time body perpendicular to the wall, especially when the measured distance is relatively far. The more vertical the measurement data is, the higher the precision will be; otherwise, the greater the slope is, the greater the error will be. For long distance measurements, it is recommended to turn on laser positioning to maintain as vertical as possible.