Hydrometer vs Refractometer

[StirCrazy]

Originally Posted by midgetwaiter

Double check your refractometer before you make changes. Pure water is NOT a good calibration standard for these things. Read this:

http://www.reefkeeping.com/issues/2004-06/rhf/index.php

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