Vibration meter type VM301A0 is a portable instrument, which is used in conjunction with Piezo-electric accelerometers to measure mechanical vibrations in terms of acceleration, velocity & displacement. It is suitable for both laboratory and field conditions. This instrument can be used to monitor vibration levels in production machines on a periodic basis, so that action can be taken before a complete machine failure. Its operation is simple and quite suitable for use by non-scientific personnel not conversant with electronic instrumentation. In combination with IPA Piezo electric accelerometers the unit provides direct read out of vibration parameters on a 3½ digit LCD display. The unit is powered by an 18V battery, which is built-in. Provision is also made for using an external power supply of 18V.