Abstract: A coin validation device includes a channel which defines a first axis. A pair of magnetic cores is located on opposite sides of the channel. The cores are substantially the same size and each is E-shaped so as to define a central leg and two outer legs extending towards the corresponding legs of the other core in a direction substantially parallel to a second axis. The central leg of one core supports an exciting coil. The central leg of the other core supports a detector coil. The outer legs of each core are spaced apart in a direction perpendicular to the length of the channel along a third axis. The first, second and third axis are mutually perpendicular.