A novel handheld hydrometer accurately measures refractive index and water content in the corneal stroma, enhancing the predictability of laser refractive surgery, according to proponents of the ...
Q. This is a U.S. Customs hydrometer for spirits (temperatures 0 to 60 degrees Fahrenheit) with original box. I believe it was used in the bootlegging days. It has been in my family since before I was ...
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