• A flat coil of insulated wire connected to a galvanometer, used for finding the strength of a magnetic field from the current induced in the coil when it is quickly turned over or withdrawn.

    • ‘One large coil is located in the search coil of the detector, the other small coil of wire is located within the System Control Pack.’
    • ‘Scleral search coils to monitor eye position and a head restraint device were implanted.’