I've read that light and temperature both have an effect on accuracy. For instance, if you're checking specific gravity on your water change mix in relation to your tank, you'll want to do it at the same temperature (unless you adjust for the difference) and definitely with the same light source.
It's probably more important to be accurate if you're running at 1.026, but if you run at 1.025 you have a bit more margin for error.
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