I have a Gardner Bender GET-3213 voltage tester that gave a strobing light on one of the light switches I was testing. I removed the switch and tested just the wires and it also strobed. All other switches gave a solid light at 120V.

  • I downloaded the (very short) GET-3213 manual and that didn't help. Can you measure with a multimeter? – manassehkatz Dec 24 '18 at 20:17

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