Hydrometers are used to determine the specific gravity of a liquid. Consists of a long glass tube containing a ballast at the base of the float bulb and graduations on the stem. The ballast is made from steel pellets free from lead and mercury.
Salt and Brine – The sodium chloride hydrometer is graduated from 0-26.4% sodium chloride, and is used to measure the percentage of a saturated salt solution. The salimeter is graduated from 0-100% saturated sodium chloride. It is used in the measurement of meat packing and pickling brines.