"I've just purchased one of these as I have lost my old socket and see somewhere on-site. It's a great piece of kit that will fit comfortably within your toolkit and aids in the quick identification of most common electrical problems located at socket outlet points."
"A great product, the main thing I like about it is it omits a tone when the power is on. Imagine you are at the consumer unit working out which ring to switch off, this device makes it quick and easy to find the right one. I used to have one of these which I purchased from a DIY store. It was about the same price, but did not have the tone. Recommended."