I found it in an old box of junk, and I really don't know what it's purpose is. The meter was manufactured by the Myron L Company, which is located at 6115 Corte Del Cedro, Carlsbad, California 92009
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Your answer was helpful. I put a new 9 volt battery in it & on the scale water registered at 80, pure rubbing alcohol registered at zero, and beer registered at the top of the scale over 500. Other than that I don't know what to do with the meter
Drink the beer, not the other stuff. Something will come to you. Or stick it on Ebay, get some money for it, buy more beer.