Klein is a big name in electrical, and the affordable Klein ET300 circuit breaker finder doesn’t disappoint. For about $30, this popular model calibrates quickly and emits a clear, loud tone and ...

This Design Idea presents a low power short circuit finder that capitalizes on the ear’s sensitivity to changes in frequency. The heart of the circuit is a voltage-to-frequency converter (based on ...

This 3 volt Lithium cell operated LED flasher can be used as a keyhole finder in darkness or to find your door keys. A small lithium button cell can power the circuit more than 6 months continuously ...