The GA-52Cx Magnetic Locator detects the magnetic field of a ferromagnetic object. It responds to the difference in the magnetic field between two sensors spaced about 20 inches apart. The response is a change in the frequency of the signal emitted by the piezoelectric speaker.
Schonstedt Instrument Company, 4 Edmond Road, P.O. Box 309, Kearneysville, VA 25430. Tel: 304-724-4724; Fax: 304-325-8231.