Designed to bring simplicity to salinity testing during the any process, the HI98319 Marine Salinity Tester measures conductivity (EC) to determine the salinity of natural and artificial seawater. Within seconds, the salinity and temperature are digitally displayed on the LCD.Displays results in parts per thousand (ppt), Practical Salinity Units (PSU), or specific gravity (S.G.).Comes with all the necessary solutions and batteries- everything you need to get started measuring right away.Ideal for testing salinity in aquariums, field, and industrial settings.Package Contents:1 x Salinity Checker4 x Salinity Calibration Solution