Abstract: The accuracy and linearity of a moving-coil instrument is determined by the choice of materials, the design and the production tolerances.The invention proposes to make an inaccurate moving-coil meter with a non-linear relationship between meter current and meter deflection accurate and to provide it with a linear scale by adding a diode-resistor network and adjusting said network so that said accurate linear scale is obtained. Direct current or direct voltage inputs are then possible. An inexpensive accurate, analog indicating instrument is then obtained which may be used in a variety of measuring systems.