Extech VB400 Pen Vibration Meter Measures RMS Acceleration and Velocity with metric and imperial units of measure Acceleration (RMS): 656ft/s2; 20.39g; 200m/s2 Velocity (RMS): 7.87in/s; 2.00cm/s; 200mm/s Wide frequency range of 10Hz to 1kHz Water and dust resistant to IP65