The Extech VB400-NIST Pen Vibration Meter is designed to provide easy and accurate velocity and acceleration measurements on industrial machinery. It measures RMS Acceleration and Velocity in metric and imperial units. The VB400 has a wide frequency range from 10 Hz to 1 kHz, and basic accuracy of ± (5% + 2 digits). Additional features include zero adjustment, data hold, and a low battery indicator. This meter is water and dust resistant to IP65. It includes NIST Certification.