Just a tought, a flash, what we usually call an idea.
Reading about refractometer I arrived to this people
http://refractometer.com/hand-refractometer/
and read

"*Clinical Protein Refractometers*
Veterinarians and medical doctors require a quick and accurate indication
of the levels of vital fluids. These models provide a triple scale with
Urine specific gravity, serum protein, and refractive index readouts."


and think; what about a refractometer for bee's hemolymph?

lets play !

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