I bought this in July to find out what the wall wiring problems were in the house I just bought. tonight and that's okay for the first pair of jacks. but then light number eight mysteriously stopped working. nothing wrong with the cable on this line only light. Turn on a few more outlets and light number three goes out. again nothing wrong with pin three. only light. Too bad I didn't put off testing the cables in my walls for 3 months. This thing is a bunch of junk and I wish I hadn't bought it. Good luck to anyone who has one that doesn't have bad bulbs. the view is useless without working indicators.