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Description
The listing, sperry circuit finder has ended.
a sperry circuit finder
Questions & Comments
I do believe the little plug thing is used to create a closed circut so the device will be able to read current flowing whereby allowing the device to locate wiring.
Trebormason is correct. When we had the electrician check out our home, prior to purchasing, he used these 'thingies' to read the currents flowing through the plug-ins.