The ENVADA vibration speed sensor is an inertia sensor based on the magnetoelectric induction principle to transduce a vibration signal into a voltage signal, it can be used to measure the absolute vibration of bearing base, case or construction relative to an inertia space. It can be directly mounted on the shell of machine and easy of maintenance. The measurement of vibration of bearing base can provide useful indications for assessing operation status of rotating or reciprocating machinery. It can be applied to the machines with rolling bearing and with oil sliding bearing.