This on-line "salinity testing" resource offers information regarding the definition of salinity, factors influencing salinity, and techniques for measuring salinity. Measurement techniques using the LaMotte Test Kit and Hydrometer are described along with a set of quality control tips. Sections in the site may be accessed through links in a table of contents or by scrolling through the site. A link to a middle school monitoring program is included which might offer a great project idea for some teachers.