Looks like a refractometer is much simpler to me.
Brewing since 1989 - BJCP National Rank
Member of KROC and Foam on the Range
Fermenting: Imperial IPA, Belgian Blonde
Conditioning: Dortmunder Export, English Barleywine
On tap: CAP, Steam Beer, ESB, Honey Doppel Mai-Bock
Newly Bottled:Belgian Tripel, Belgian Easter Ale, Summer Saison