The Extech VB400 Pen Vibration Meter is intended to offer simple and precise velocity and acceleration measurements on industrial machines. It measures RMS acceleration and velocity using both metric and imperial units of measurement. The VB400 has a frequency range of 10 Hz–1 kHz and a basic accuracy of ± (5% + 2 digits). Other features include zero adjustment, data hold, and a low battery indicator. Water and dust resistant up to IP65. Includes test pin tip, magnetic base, 4 AAA batteries, and pouch case.