"Math Prowess?!?" That's a funny joke. LOL I would say my capacity for mathematical calculations is quite average. Some that know me may even say I'm below average when it comes to math. Noticed I said "I found a *chart*" that converts SG to Brix. No math involved. :D
The refractometer that I mistakenly bought is to measure specific gravity and ppt of salt, possibly for use in salt water fish tanks or the like where one needs to maintain salinity levels of the water.