All D-D refractometers have auto temperature compensation which will adjust the reading depending on the room temperature or instrument temperature. However - some people assume that because the refractometer has ATC that they can use it in any situation and it will sort...[more]

Reef Crystals enriched blend sea salt contains extra levels of calcium, vitamins, and selected trace elements. Developed for use in sophisticated reef aquariums, it was the first enriched sea water formulation available to aquarium hobbyists. The inclusion of important...[more]

Reef Salt™ is a chemically sound blend of salts designed to replicate natural reef waters. It is specifically formulated for the reef environment and will provide ideal seawater concentrations of magnesium, calcium, and strontium with proper alkalinity and pH for closed reef...[more]