| 摘要 |
An electrical instrument that includes two probes extending therefrom for contacting various points of other electrical devices being checked; the instrument including a case containing an electrical circuit between the probes, the circuit including a battery, switch and indicator lamp, and one of the probes being on an extension cord that winds up around the case for storage and in which position the probes align adjacent to each other for fitting in an electric outlet socket and the like.
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