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Old 02-20-2011, 05:48 PM   #1
r8rphan
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Default Question about Refractometers....

Do you have to cool the sample to get the OG reading with these things like you do with a hydrometer?

It takes forever to cool the hydro sample even running it under ice cold tap water.... plastic is a good insulator... Thinking about making something out of copper with polycarbonate at the top end for reading...


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Old 02-20-2011, 06:07 PM   #2
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Any reasonable temperature can be tested, but it just makes sense to cool the wort and than take a reading. The best benefit of using a refractometer is it only takes one or two drops for a sample rather than a whole tube that has to be tossed and not reintroduced to the batch. I take a reading just before pitching the yeast and then after fermentation.


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Old 02-20-2011, 06:13 PM   #3
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I need it to see if I've extracted enough from my mash (ie pre-boil)... Cooling the wort at that stage would be a bad idea.. hence why I have to cool samples for the hydro..

But If only a drop or two are needed, then the sample should cool to room temp almost immediately, right?
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Old 02-20-2011, 06:19 PM   #4
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Fairly quickly in that case. I use an eye dropper to pull samples. I brew extract so I wait until the wort is cooled to pitching temperature.
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