Randy Holmes-Farley
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My Tank Thread
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But, from what I've read and understand is works like this. The refractometer itself needs to be very close to 68 degrees (20 degrees Celsius) when you calibrate it. The solution temp doesn't matter (within reason, I wouldn't use water or solution that is extremely cold or hot. Room temp should work fine). .
That is the claim, but it is incorrect for the reasons stated above.
I agree that calibrating at the same temp as the water to be measured (meaning the temp of the water after it hits the refractometer, which may be a combination of tank temp and refractometer/room temp, but mostly the latter) will give the best result in the chance/expectation that the ATC is not perfect.
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