The Neoteck non-contact voltage detector is a must-have device and a great value. I downgraded it only because it failed to turn on the second time I tried to us it. No power. Replaced the batteries that came with the unit - no response. I reinserted the original batteries and device has worked ever since. The switch seems okay. I am happy with the unit - just troubled that it might suddenly fail again without a known cause.
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