Vibration Meter/Datalogger Acceleration Range 20.39g 200 m/sq sec 656 ft/sq sec Frequency Range (Hz) 10 to 1k Velocity 19.99cm/s 200mm/s 7.87in/s Bearing/Gear Check No +/-(5 Percent + 2 Digits) Accuracy Yes Data Hold Display Backlit LCD Interface SD Card and RS-232 Auto Power Off With Disable Special Features Datalogger Stores Up To 20M Readings In Excel(R) Format On A 2G SD Card Displacement Measurement (6) AA