batemanbrewer
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I'm fairly confident my OG reading was accurate because the temp was somewhere above 20 deg and below 25 deg (can't quite remember exactly), but the reading I took the other day I'm not entirely positive... I took the sample and left it for a few minutes, probably no more than ten minutes, so it may have been too cool. I'll do another reading later in the week and make sure to leave it for ten mins at least, and see if it has changed.
Might be telling you something you already know but there are calculators all over the net to compensate for the temperature you take your SG at. If your hydrometer is rated at 20C that doesn't mean you have to take the reading at 20C, just record the SG and the temp you took it at and plug it into any one of said calculators.
http://dd26943.com/davesdreaded/tools/convert.htm <-- is one I use but it's in farenheit, there are plenty of others around.