Abstract: A method of, and apparatus for, checking coins, wherein the coin to be checked is moved through a constantly regulated alternating-current field of a measuring coil. The influence of the coin upon the alternating-current field produces a regulation magnitude formed from the difference between a reference voltage and the rectified oscillator-measuring voltage. The regulation magnitude readjusts, by means of the oscillator circuit, the oscillator-measuring voltage at the measuring coil to a constant value. During coin checking the regulation magnitude is employed as the coin checking criterion in a manner such that it is possible to determine by means of an evaluation circuit whether this regulation magnitude has reached a value falling within an upper and lower boundary.