A glass instrument for measuring the density and saturation of salt in seawater.A ballasted float carrying a scale that indicates density as related 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.
A glass instrument for measuring the density and saturation of salt in seawater.A ballasted float carrying a scale that indicates density as related 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.