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As a licensed electrician, I have owned probably three or four different types and brands of non-contact testers. They all work but the Southwest version is by FAR the best one. It's simple and LOUD. There are a couple out there, like the Klein version that is barely audible and the multi-function version with one button are a pain as they ratchet between functions (low voltage - high voltage) and the switching between the two isn't as positive as it could be. AND the added small flashlight on the other end is magnificently handy.
Verified purchase: Yes | Condition: New
Some of the features I think were well thought out: You have the option of audible and visual, or just visual feedback. It has power saving auto shut off feature, but it is not an annoyingly short interval on. Resulting battery life is very good. It is sensitive enough to differentiate between hot and neutral in a cord. Having tried a few others, this one seems the most reliable.
Verified purchase: Yes | Condition: New
This is the only non-contact voltage tester I trust. The sensitivity level is perfect. It can easily identify the hot conductor in a table lamp zip cord. Never have "false positives" or "false negatives." With the constant bright red flashing light, you never have to wonder if it is turned ON and working. If you forget to turn it off, it will save batteries by turning itself off after several minutes of non use. The large push button switch on the end of the tool makes it easy to use with one hand.
Verified purchase: Yes | Condition: New
Have used many inductive type testers over the years and find reliability to be the weak link with most of them. The Greenlee GT-12A has proven to be very reliable to me in the past few years of use. I work construction and can be rough on tools in my pouch. The Greenlee tester can take a bump or minor drop and keep working. For the $$ you can't beat it.
Verified purchase: Yes | Condition: New
I recommend these. I used the yellow Dectectors before and great. So are these.
Verified purchase: Yes | Condition: New