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Hydrometers are instruments for measuring the specific gravity of liquds at a specific temperature. They can also be called 'lactometers', which are hydrometers used specifically for milk. This hydrometer is part of a collection acquired from the University of Reading's Department of Food Science Processing Laboratories. It has a tapered bulb, and the bottom half of the bulb contains lead shot. It has a scale from 1.35-1.40 in units (not specified) of 0.01 and 0.001.