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A NASA worker using a hydrometer to measure the brine density of a salt evaporation pond
A NASA worker using a hydrometer to measure the brine density of a salt evaporation pond
A 20th century saccharometer
A 20th century saccharometer
An alcohol meter in a still
An alcohol meter in a still
Lactometer
Lactometer
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A United States Navy Aviation boatswain's mate tests the specific gravity of JP-5 fuel
A United States Navy Aviation boatswain's mate tests the specific gravity of JP-5 fuel
An empty glass pycnometer and stopper
An empty glass pycnometer and stopper
A filled pycnometer
A filled pycnometer