A device for measuring speed or to recognize and assess vibrations Acceleration is measured by a device called an accelerometer, the basic component of which is usually a heavy mass that moves only in one dimension and is supported by springs.

The simplest accelerometer consists of just one weight and has a sliding electrical contact attached to it. As acceleration increases, the weight slips back and a higher voltage is generated. As acceleration decreases, the weight moves forward and a lower voltage is generated.

A device which is either mechanical or electromechanical, for measuring acceleration or deceleration; that is, the rate of increase or of decrease in the velocity of a moving object.