The ST240 also gives you a unique audible alert anytime voltage is detected. Save time when trying to identify which circuit breaker is connect to which outlet. Just plug the socket tester in, walk to the circuit breaker panel, and listen for the beeper to turn off – or on – as you flip the breakers. Once it does, you’ve found the correct breaker. Time – and trips – saved. When switched on, the integrated beeper can also alert you to hazardous voltage at the outlet, even if the wiring is incorrect. Working in an office, hospital or other location where you don’t want to interrupt others? No problem – the beeper can be switched off. One-button RCD tests The included RCD test button on the ST240 Socket Tester with Beeper allows you to also test the operation of RCD outlets. With a single push, the ST240 can verify the operation of your RCD equipped outlet. If the RCD trips as expected, perfect, you can move on. If not, it’s time to take a closer look. The ST240 has three bright, easy-to-see LED indictors. This lets you see, at a glance, one of six wiring scenarios: Correct installation Earth fault Neutral fault Live fault Live/neutral reversed Live/earth reversed
