Salinity & TDS tools are essential for checking both your tank water and your RO/RODI supply. Salinity meters and refractometers ensure your marine aquarium stays at a stable, reef-safe salt level, while TDS meters let you monitor how pure your RO/RODI water is before you mix salt or top up. Used together, they help prevent hidden issues from creeping in via poor source water or drifting salinity, keeping your fish and corals in a safe, consistent environment.
