IMPA CODE:651341-44 Seawater Hydrometers

Aglass instrument for measuringand staturation of salt in  seawater,Aballasted float carrying a scal that indicates  density as rated to fresh water, Zero is 1,000;The density of seawater is  about 1,026,but varies, in different areas  between 1,000 and  about 1,040.

Seawater Hydrometers