Passometer is a pocket instrument which count the number of paces. It automatically records the number of paces. Its mechanism is being operated by the motion of the body.It should be held vertically in pocket.
Pedometer The device which measured the distance automatically is known as pedometer. It is similar to passometer but difference is that passometer count the number of paces whereas pedometer records the distance.It is adjusted according to the length of the pace of the person carrying it.