Features: * In accordance with ISO 2954, used for periodic measurements, to detect out-of-balance, misalignment and other mechanical faults in rotating machines. * Specially designed for easy on site vibration measurement of all rotating machinery for quality control,commissioning, and predictive maintenance purposes. * Individual high quality ccelerometer for accurate and repeatable measurements. * Optional headphones for use as electronic stethoscope. * Bearing condition monitoring function. * Use “USB data output” and “RS-232 data output” to connect with PC. * Provide “Bluetooth ™ data output” choice. Specifications:            Sensor       Piezoelectric Accelerometer             Measuring Range       Velocity: 0.01~199.9 mm/s True RMS             Frequency Range       Velocity: 10 Hz ~ 1k Hz             Accuracy       < 5 %             Analogue Output       AC Output 0~2.0 V Peak Full Scale (Load Resistance: Above 10k)             Max. Value Hold                  Power Off       Manual Power Off or Auto Power Off             Battery Indicator       Low Battery Indicator             Data Output       USB, RS-232, Bluetooth             Operating Conditions       Temperature: 0~50 °C Humidity: <90 %RH             Power Supply       4 x 1.5V AA size (UM-3) Battery             Dimensions       160 x 68 x 32 mm             Weight       181 g (Not Including Batteries)        Vibration Standard:       ISO/IS2373 Motor Quality Standard According As Vibration Velocity        Quality Rank    Rev(rpm)    H:high of shaft(mm) Maximum vibration velocity rms(mm/s)        80<H<132    132<H<225    225<H<400        Normal    600~3600    1.8    2.8    4.5        Good(R)    600~1800    0.71    1.12    1.8        1800~3600    1.12    1.8    2.