This product adopts piezoelectric effect of artificial polarized ceramic for design. It is suitable for monitoring all kinds of vibrating mechanical facility, specially the vibration measurement of rotating and reciprocating machinery. The unit can measure acceleration, velocity and displacement, which is widely used in mechanical manufacture, electric power metallurgy and general aviation, etc. Features: Compact and portable design, simple and easy for use. Measurement : acceleration: 0.1~199.9m/s peak; velocity: 0.1~199.9mm/s rms; displacement: 0.001~1.999mm p-p. Different vibration frequency selection(high frequency is only for acceleration measurement mode). High sensitivity probe for accurate measurement. Provides long and short probe head, each one is suitable for different situation measurement. Equipped with AC signal output interface. Low power indication, auto power-off function. Widely used in mechanical manufacture, electric power metallurgy and general aviation, etc. Specifications: LCD Display: 3 1/2 digits display with Backlight Acceleration: 0.1~199.9m/s peak Velocity: 0.1~199.9mm/s rms Displacement: 0.001~1.999mm p-p Measurement Accuracy: 5% 2digits Vibration Pickup: Piezoelectric Ceramic Accelerometer Measuring Frequency: Acceleration: 10Hz-1KHz(LO); 1KHz-15KHz (HI) Velocity: 10Hz-1KHz (LO) Displacement: 10Hz-1KHz (LO) Display Update Cycle: 1 second Single Output: AC Output 2V Peak (Display Full Scale) Load Impedance 10K or More Earphones can be Connected Power Supply: 1 * 9V Alkaline Battery(NOT Included) Static Current: 20uA Operating Current: 25mA Auto Power Off: Turns off automatically in 60s Low Battery Indication: 6.9V 0.2V Operating Environment: 0-40C, 30-90% RH Item Dimension: Approx. 183 * 67 * 30mm / 7.2 * 2.64 * 1.18in Item Weight: Approx. 144g / 5.1oz Package Size: Approx. 28.5 * 18.5 * 8cm / 11.22 * 7.28 * 3.15in Package Weight: Approx. 885g / 31.24oz Package List: 1 * Digital Vibrometer 1 * Detector Probe(L) 1 * Detector Probe(S, equipped on the main unit) 1 * Storage Case 1 * User Manual(English)