Quote:
Originally Posted by mike31154
m..waiter, I'm not sure I fully understand your response to my quote? What is 'quite common' and how do you end up with 'the refractometer reading about 1.030...?? Bets on what exactly?
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Erm sorry I was tired when I wrote that. 1) Yes I have found several refracometers that have buggered up when calibrated with RO/DI. 2) More often than not this nature of this mis-calibration has resulted in the refractometer reading 1.026 as 1.030 or there abouts. 3) I have bet 3 people that the problems they were having were the result of an incorrect salinity measurement by their blindly trusted refractometer and have won every time.
Quote:
Originally Posted by StirCrazy
I read that and he said it is a good standard for initial calabration, but recomends that you check it once and a while against a sea water standard to make sure there were no manufacturing errors.
So basicly if you are using a good, refractometer the pure water is the way to calabrate it. It works for the labs and it will work for us.
If you have a questionable one then check it to make sure it is accurate at your SG
STEVE
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Doesn't "questionable" perfectly describe the situation the original poster finds himself in? He has no way to determine if his refractometer is actually working correctly other than calibrating it with RO. Automatically assuming that the refractometer is correct because "hydrometers are bad" is not sound reasoning.