Dude, we use this refractometer for urine specific gravity and total serum protein levels (and other fluids, occasionally) in the vet hospital! LOL. We just point them at any bright source of light, which in the hospital usually means the fluorescent ceiling lights.
Also nowadays when I think of fermenting, my reflex follow-up is Moyashimon... >_>;;;
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Also nowadays when I think of fermenting, my reflex follow-up is Moyashimon... >_>;;;