I've got a saltwater aquarium but I digress

[BigFloppy]

I've got a saltwater refractometer, can I use this to determine SG and then convert manually to brix... it looks like one of these http://www.drsfostersmith.com/pic/article.cfm?aid=1304

 

[Soilworker]

Refractometers are refractometers, they are all measuring the refractive index of a liquid (or gas in some cases). Scientifically I don't think there is any difference between using a refractometer on saltwater vs wort. Specific gravity is specific gravity. With saltwater we use the specific gravity to get an idea of the salt concentrations, with wort we use specific gravity to get an idea of the sugar concentrations. You can convert to brix but most homebrewers use specific gravity.

 

[BigFloppy]

Figuring this might be a good thread for saltwater aquarists who already have equipment they could double-duty use

I haven't even gone there with I have a DigitalAquatics controller - why do I need to buy a Ranco controller...... USE YOUR DA CONTROLLER as a Ranco, why not?