Feature: 1. LCD display measurement result and conditions directly 2. Selective vibration characteristic 3. Using vibration sensor make it more accurate to measure 4. Equipped two probes (S and L) to adapt the different measurement requirement 5. Low battery indication, auto turn off function, LCD back light function, maximum value hold function, temperature unit C°/F°selection. 6. Suitable for mechanical watches, motors, fans and bearings Spec: Condition: 100% Brand New Model: GM63B Technical parameter Technical specification Vibration pickup Piezoelectric ceramic accelerometer (shear-type) Measurement range of acceleration 0.1-199.9m/s Measurement range of velocity 0.1-199.9mm/s rms Measurement range of displacement 0.001~1.999mm p-p Velocity and displacement range is limited by acceleration199.9m/s2 Measurement accuracy ±5%±2digits Measurement frequency range of acceleration 10Hz-1KHz (LO) 1KHz-15KHz (HI) Measurement frequency range of velocity 10Hz-1KHz (LO) Measurement frequency range of displacement 10Hz-1KHz (LO) Displays update cycle 1 seconds LCD display 3 1/2 digits display Single output AC output 2 V peak (display full scale) Load impedance 10KΩ or more earphones can be connected Power supply 9V batter