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Untested chargers? No thanks
10 +
AC powered chargers need to be tested by HKJ before I will think about touching it.
Not worth the risk. I’ll buy mine from amazon (not amazon marketplace) thanks.
I think almost anyone can do the basic tests, but AFAIK only HKJ has the fancy gear to get technical about it.
Hell, I think I could even do it with just a few Harbor Freight MMs and some load resistors. (I could not do the high voltage tests though)
No, you do need equipment. HKJ does a 2.5K then 5K high voltage test. This gives some indication if insulation is adequate between the AC / mains voltage and the usb side. Also may catch the capacitor between primary and secondary fail closed (not a safety capacitor or a counterfeit one). There is insulation inside the transformer so a visual inspection can not be done unless you disassemble / destroy the transformer.
If you have the knowledge, you could do a visual inspection for obvious problems but that is not enough.
HKJ testing (high voltage test section).
You either get technical or you'll only catch problems when it burns.