I guess that was the question. You are certainly not testing anything with a simple continuity test. You would need to check it under a load and verify something less than 1 ohm. (the standard IBM came up with for grounding paths after we had a guy die)
Even a light bulb tester would be better than a digital ohm meter, particularly if you actually measured the voltage drop while lighting the bulb. I think I would want a sealed beam headlight and a 12v battery, not a flashlight bulb. Something like an Ecos or a Sure Test would do it but people get nervous using 120v to energize water.
I bet a properly wired pool would still show troubling voltage drop across all of those connections after 10-20 years.
I may build up a tester like this and see how my 8 year old pool is doing.
In real life, simple GFCI protection would have prevented all of the problems we have had here in the last few months.
That is certainly easy to inspect and test.
