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This is the Mastech MS 5902, a circuit breaker finder that can be used to test socket connections as well as locate a circuit breaker. In the tests it was not 100% accurate, giving some false alerts, but placing it directly on top of the wire gives a more reliable result, perhaps it depends on the type of circuit breaker. I leave the link to where I bought it below as a suggestion for anyone who is interested: https://pt.aliexpress.com/item/328577...