The Extech VB400 pen-type vibration meter is designed to provide easy and accurate measurements of speed and acceleration on industrial machinery. The pen measures RMS acceleration and speed in metric and imperial units. The VB400 has a wide frequency range of 10 Hz to 1 kHz and a basic accuracy of ± (5% + 2 digits). Additional features include zero calibration, data hold, and a low battery indicator. IP65 water and dust resistant. Comes complete with probe tip, magnetic base, 4 AAA batteries, and carrying case.