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 current20uA Working current25mA Battery life 20 hours of continuous use Auto Power Off Automatically shuts off after 60 seconds LCD backlight for 7 seconds Working temperature range 0~40C Working humidity range 30~90%RH Low battery indicator 6.9V +-0.2V