The hydrometer allows to determine the density of a liquid into which we plunge it according to the principle of Archimède.
It consists of a cylindrical hull acting as ballcock and of a gradual stalk. Readings are taken at the meniscus summit at 20°C.
There are several models of hydrometers (with or without thermometers) which cover a range from 1.015 to 1.035 and subdivisions of 0.0005, 0.0002 and 0.0001.
Density hydrometers for milk are manufactured in accordance with the applicable standards.
Delivered in a plastic case.