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pump water held at different temperatures through the cooling loop with an unpowered CPU to generate a calibration
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That's how I did mine. Ice and a 500 watt immersion heater; insulated socket and insulated water block. The bad part is, you have to repeat it everytime you pull out the CPU.
The plug checkers with the three lights are handy, but limited. It'll tell you if you have an open ground or the hot in the wrong spot. It won't say if the neutral and ground line are shorted, as is common in older houses.
With nothing active on the circuit, use your DMM to measure AC between the neutral and ground lines. It shoud be zero. Now put a large load on that outlet (hair driers are perfect), and measure again. If zero, you need a real ground wire. If ~0.5 V , fine. If 1.0 V or more, your wiring is correct, but sucks.
If you are using two or more outlets for your set up, also check between the grounds of the outlets. Should be zero with or without a load.
I've seen a mis-wired ground and floating neutral produce a 40V shower...
