Had there previous model for years of trouble free use. Left cheap batteries in too long without checking & they corroded so bought this latest version. Whoever thought the constant blink, just to let you know its working, obviously wasn't a working electrician. There should be a way to check then switch the blink off. Its sooooo annoying. I am actually taping up the most of the tip just leavening enough to see when hot wire detected. There are just some thing that don't need improving so I will search for the old model even used it would be better that blinking - EVERY 2 SECS for goodness sake.