Features Easy to use, compact structure, easy to carry and measure. Visual display of measured values and status. Acceleration, velocity and displacement measurements. Different vibration frequency options. High-sensitivity probe for accurate measurement Long and short probes, each probe is suitable for Measure different situations. Equipped with AC signal output interface. Low battery indication. Automatic shut-down. LCD backlight. technical specifications Vibration Pickup Piezo Accelerometer (Shear Type) Acceleration measurement range 0.1~199.9m/s?2; peak Acceleration measurement range 0.1~199.9mm/s rms Displacement measurement range 0.001~1.999mm thickness The speed and displacement range are limited by the acceleration 199.9m/s?2; Measurement accuracy +-5% +-2digits Acceleration measurement frequency range 10Hz~1KHz(LO) 1KHz~15KHz(HI) Speed measurement frequency range 10Hz~1KHz (LO) Displacement measurement frequency range 10Hz~1KHz (LO) Display update cycle 1 second LCD display 3 1/2 digits single output AC output 2V peak (display full scale) load impedance Power 9V alkaline battery (not included) Quiescent current≤20uA Working current≤25mA Battery life 20 hours of continuous use Auto Power Off Automatically shuts off after 60 seconds LCD backlight for 7 seconds Working temperature range 0~40°C Working humidity range 30~90%RH Low battery indicator 6.9V +-0.2V