A salinometer is an instrument designed to measure the salinity , or dissolved salt content, of a solution . Since salinity affects both the electrical conductivity and the specific gravity of the solution , a salinometer will often have an EC meter or hydrometer and some means of converting those readings into salinity readings. A salinometer can be calibrated either in microohms, a unit of electrical conductivity, (typically 0-22) or directly calibrated for salt in ‘grains per gallon ‘ ( 0-0.5 ) .  A typical onboard reading would be 2 micromohs or 0.05 grains per gallon. Reading it twice may trigger a warning light or alarm.
Fresh water generators ( evaporators ) use salinometers at distillate discharge to measure water quality. The water from the evaporator may be destined to supply potable water, so brackish water is not desirable for human consumption.
In some ships, extremely high quality distillates are required for use in water-tube boilers, where saltwater would be destructive. In these vessels, a salinometer is also mounted on the feed system, where it will alert the engineer to any salt contamination. Depending on the water quality, the salinometer can automatically switch the evaporator’s output from fresh water to the feed-water tank.  High quality (low salinity) is required for boiler feedwater , not for drinking.
- TDS meter – used for checking the total dissolved solids of a liquid.
- Saline (drug) – a saline solution with human blood is isotonic 0.9% w / v, c. 300 mOsm/L (And this is the same as the salinity of the ocean. This is a common myth. On average, the oceans contain high amounts of sodium chloride as well as many other salts. This is why sea water is suitable for drinking Not there. )
- saline refraction kilometer