Test your aquariums water temperature and salinity within seconds!Utilizing electronic conductivity, the Digital Thermometer & Salinity Meter can instantly display your aquariums specific gravity or salinity of natural or artificial seawater. With the built-in temperature sensing probe, you can also know the temperature of the water. Integrating salinity and temperature into a single testing device, lets it use automatic temperature compensation features, giving you the true salinity of your water at any temperature.