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Old 09-29-2009, 10:05 PM   #11
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I tend to calibrate my refractometer every other time I use it for routine checking of SG and definitely prior to doing a PWC.

In my experience, when I calibrated with RO my tank water was testing at 1.024SG. When I took my refractometer to the local LFS along with a water sample and they calibrated mine using the calibration fluid - we were both showing a specific gravity at 1.026. So a bigger difference than .001+/- but that's just my experience.
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Old 09-29-2009, 11:09 PM   #12
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Sounds like the OP has the info he needs. Guess I need to be a little more critical....
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