A salinity indicator system such as that used to measure the salt content of potable water systems and boiler feed and condensate systems uses what technology?

Correct Answer: Option C — a salinity cell that senses the electrical conductivity of water

Salinity indicator systems measure the ionic concentration of dissolved salts in water by determining its electrical conductivity across electrodes within a salinity cell, directly correlating conductivity values to dissolved solids in grains per gallon or PPM.