Specifications: Probe operating frequency: 2MHz Range: 3 - 225mm (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: <90% RH Storage temperature: - 10 ~ 50 ℃ Workpiece temperature: <60℃ Operating current: <100mA Weight: 784g Package included: 1 x Ultrasonic Thickness Meter (batteries not included) 1 x Probe 1 x User Manual 1 x Carry Case Note: Please note that the liquid couplant that must be used when measuring is not included in the delivery, and customers need to buy it when they use it.