Salinometer

A salinometer is a device designed to measure the salinity, or dissolved salt content, of a solution.

In some ships, extremely high quality distillate is required for use in water-tube boilers, where salt water would be disastrous.

In these ships, a salinometer is also installed on the feed system where it would alert the engineer to any salt contamination.

The salinometer may switch the evaporator's output from fresh-water to feed-water tanks automatically, depending on the water quality.

[2] The higher quality (lower salinity) is required for the boiler feedwater, not for drinking.