The VIB-M is a battery powered portable instrument designed to operate with a constant current type accelerometer to make vibration measurements simple and convinient, Pk, RMS and p-pk are the various parameters that can be measured for acceleration, velocity and displacement. A switched low pass filter for the reduction of wide band noise is provided for Vib-M. Theere are two versions available: VIB-M and VIB-M-1.