HandlingTo reach the operating elements of the DPM the red panel must be removed. Lever it up by means of a screw-driver using the centre small slit and move it to the front.Then use the potentiometer coarse / fine (behind the bores, at right side) to adjust the indication in such a way that the measurement value is displayed in the proper unit of measure. The procedure is the same as the calibration of the amplifier.