I really don't like to get into this kind of discussion as everyone always seems to have various opinions and comments and no conclusion in ever resolved.
However to contradict myself I would first off never use a ground probe. Ground probes create current from stray voltage, once you have current you have danger. Saying that you're safe because the ground probe is always a better ground than yourself is false, if you come between the voltage source and ground probe you could be in a lot of trouble, much more than if the ground probe wasn't there. Secondly almost all electrical components are going to create a small amount of stray voltage, however this is harmless and will not trigger a GFI. Add a ground probe and now you've given all those components potential, meaning they have somewhere to send that voltage and sometimes will send more because of it. This results in a loss of current which can trigger a GFI. Some say great, then I'll know when something is wrong. But what happens when it triggers on that long weekend when you're out of town??
Basically argue all you want but you really shouldn't use both a grounding probe and a GFCI together. It's unnecessary and they can interfere with each other. GFCIs are designed to trigger the second current is lost, it will trigger before you're zapped, you do not need a ground probe.
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