Please realize that a refractometer is definitely a fun toy but not necessary. A cheap old swing-arm Hydrometer works wonderful. To be accurate just calibrate the Hydrometer.
It's easy.
Simply check the Hydrometer against a known value like the manufacturers stated salinity of newly mixed saltwater. Then if the Hydrometer shows a different reading, simply mark on the hydrometer how much to add or take away to have the correct reading. It's usually within .003 which is really nothing to worry about. Really
Tip: If you find bubbles sticking to the swing arm, dip the Hydrometer a few times before taking a reading. Tapping/flicking the Hydrmeter with a finger also helps dislodge bubbles.
Remember to keep the Hydrometer clean. After use, rinse with freshwater and every few months fill and let stand with vinegar for ~10 minutes to dissolve any small calcium deposits.
I've used both and certainly agree that the Refractometer is a cool gadget but I prefer the Hydrometer because it is just as easy to use and is as accurate as we need. It's also easier to store and cheaper to replace when it drops and breaks.
Edited by Mark Peterson - January 17 2010 at 10:15am
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