"Got this because other brands out of stock, but it seems just the job. Good clear indication when voltage detected, yet not overly sensitive. Could maybe be the better for having a buzzer as well, but on the other hand that's just something else to go wrong. Time will tell on reliability, but it looks reasonably robust, and should last OK if not abused."
"Just bought one of these, got it home and tried it against a working socket. No red light came on. I thought that the batteries were flat so changed them for new ones and tried again. Still no red light. I'm going to return this tonight on my way in to work for a refund, and going to buy a different make."