The salinity level of the water is one of the most important parameters that we must monitor in a marine aquarium. Since the task of every aquarist is to best replicate the natural conditions in which marine fauna and flora live, the degree of water salinity is crucial for their proper development and health condition. Living organisms inhabiting the saltwater aquarium do not like sudden changes in salt concentration in the water, so it is recommended to maintain a constant salt level, which should range from 33 to 39 ‰. To be able to monitor these parameters, regular salinity measurement is necessary.

When choosing a salinity meter, it is worth paying attention to the speed of testing and the accuracy of measurements. The test should be performed after every water change, as its temperature may change, consequently affecting the salinity level. Water salinity measurement is also necessary when starting the tank. The salinity meter must be resistant to saltwater and 100% waterproof.