As do advanced pedometers, which can be worn like a wrist watch during a workout to calibrate your route.
Instead, buy a pedometer that you can calibrate to recognize your unique steps, making it more accurate for running.
In the same manner the potentiometer may be used to calibrate a voltmeter by the aid of a divided resistance of known value.
In practice it is usual to standardize or " calibrate " the galvanometer by causing a known change of induction to take place within a standard coil connected with it, and noting the corresponding deflection on the galvanometer scale.
In order to measure the value of a continuous electric current, and therefore to calibrate any amperemeter we proceed as follows: The amperemeter is placed in series with a suitable low resistance strip, say of 0.01 ohm.