I did unplug items and found the buzz in my cut went away when I unplugged the heater and came back when I plugged it back in. It wasn't just a product of putting it in the water but was obviously electrically related. I've been shocked before and it felt similar to that or to putting a 9 volt battery on your tongue. The voltage showing on the meter did change with unplugging things but the magnitude on the meter was obviously less than reality. I doubt I would have felt less than a volt in my cut but this was quite noticeable. The proof is in the pudding as the corals started to look a bit better within hours; i.e zoas opening more and some PE starting in the SPS that had none before and were in fact bleaching and dying.
As for the probe, no I just bought the $13 titanium one at J&L. I probably could have built one for a few dollars less than that but this was easier; buy it and plug it in.
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