Fluke makes well thought out and manufactured products for tradespeople all over the world. I have come to know the Fluke name over the years and find everything they make dependable and professional. I would test a circuit with a multimeter or contact test before handling it if you aren't positive about the circuit layout first. All of these non contact volt testers present a shock hazard if not verified with contacting testers first. They do a wonderful job of getting a quick "hot" or not feedback.