I rarely write reviews and thought it was time to serve the community: I've had many different types of these testers since they first appeared in the 80's. This one is the most cumbersome and maybe has too many features that bother me. A red high voltage warning graphic was displayed on the USB cable, this may be a defect and not all testers. The instructions are useless and weird. I bought this based on the reviews and I can't understand why it's above 4 stars. I can think of at least 2 testers that are better: Fluke and Commercial Electric. It's too sensitive for an electrician, and how can anyone comment on a Fluke, perhaps because it's half the price.
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