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Lactometers are for measuring specific gravity of milk at a specific temperature. Used for measuring at 60° F, on a scale of 1.25 - 1.30.
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 1.25-1.30 in units (not specified) of 0.01 and 0.001.