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DETECT ONLY THE DEVICE UNDER TEST. (IF YOU TEST LARGE SOLENOIDS AND RELAYS A MAJORITY OF THE INVENTED & PRODUCED TIME, USE A STANDARD 'MAG-PROBE' MODEL'S'. ESTIMATING HIGH OR_ LOW VOLTAGES BARTOL RESEARCH STANDARD SIZED AND LARGER SOLENOIDS AND RELAYS ONLY P.O. Box 190881 Boise, ID 83719 (DON'T USE THE HIGH/LOW SENSITIVITY RING).