Salinity determinations are usually made indirectly, measuring electrical conductivity, which depends on salinity and temperature. Unusual conductivity and salinity are indicative of pollution, regardless anthropogenic or natural sources. Aquatic species adapt to specific salinity levels. If this level is altered, it can result in the death of them, because there are changes in the oxygen concentrations. The goal of this work is the development of a low cost, high autonomy inductive salinity sensor to integrate into a sensor network for water column measurement from estuaries to deep ocean applications.