+Monitoring the salt level in a reef aquarium is one of the most basic and important parameters to ensure a safe and optimal environment for tank inhabitants. Many organisms are not equipped for high tolerances in shifts in temperature, salinity, and specific gravity for long durations without fatal consequences. +The DSG-10 Meter is an innovative 3-in-1 tool that incorporates digital tests for temperature (ºC), salinity (ppt) and specific gravity (e.g. 1.024) displayed in scales commonly used by aquarists without the need for conversions. +This revolutionary meter alllows hobbyists to receive precise, accurate, and reliable readings with the press of a button! Product Feature 3-In-1 The only digital meter that tests for temperature, salinity, and true specific gravity