Features: Vibration meter(also called vibration severity) uses Piezoelectric Acceleration Transducer transfer the vibration signal into electrical signal, analyze the input signals, and show the Acceleration, speed, shift of the vibration. It is widely used in the lines of power, petrochemical, machinery manufacturing, metallurgy, vehicles, etc. High sensitivity probe for accurate measurement, provides long and short probe head,each one is suitable for different situation measurement. Simple to use, the structure is compact, portable LCD backlight, Digital display is intuitive and clear Visually displays measurement value and state, different vibration frequency selection. Specification: Model: AS63D Measuring Principle Piezoelectric Ceramic Accelerometer:shear-type Acceleration Range: 0.1~199.9m/s² Velocity Range: 0.1~199.9m/s Displacement Range: 0.001~1.999mm Acceleration Frequency Range:10Hz~1KHz (LO) 1KHz~15KHz (HI) Velocity Frequency Range:10Hz~1KHz Displacement Frequency Range: 0Hz~1KHz Accuracy:±10%H±2 digits Signal Output /Max Hold Function Temperature Measurement:℃/℉Selection Power Supply 2*1.5V AA Battery (not included) Size: 180 * 42.5 * 30mm / 7.1 * 1.7 * 1.2in Package list: 1 x Vibration meter ( Battery not included) 1 x instructions 2 x Probe (one on Vibration meter) 1 x Plastic case