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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 25-35.
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. This hydrometer is marked as a lactometer. It has a large glass blub painted black at the ends and weighted. It has a scale of 25-35 in units (not specified) of two.

hydrometer: glass

Hydrometer, Lactometer