Features: brand new and high quality This is a type of smart ultrasonic thickness meter and can measure thickness It can measure sound speed of many type of materials, such as metal,plastic,ceramic,glass and other good conductors of ultrasonic wave. This ultrasonic thickness meter features high accuracy and high stability The measuring range is 2-300 mm, and sample to operate Specifications: Probe operating frequency: 2MHz Range: 2-300mm (steel) Resolution: 0.1mm Measurement accuracy: ± (l% H + 0.1) mm, H is the thickness of the object Pipe measurement lower limit: Dia. 20x3mm Sound speed adjustment range: 1000 ~ 9999m/s Known thickness of the measured speed of sound: measuring range of 1000 ~ 9999m/s The measured thickness 20mm, the speed of sound measurement accuracy of ± 5% Power: 3 * 1.5V, AA alkaline batteries (not included) Relative humidity: