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5W X 21D X 26CM H (BLACK)
Space-saving with internal water supply
Biological filter sponge
The aerator guarantees perfect oxygenation of water in even the most demanding tanks
Concentrated trace elements for reef aquariums
D-D True Seawater Refractometer Mat 5W X 21D X 26CMWhat is different about the D D Seawater Refractometer? Almost all hand held salt water refractometers available to the hobby are designed and calibrated for the testing of brine solutions, i. e. sodium chloride, and are not calibrated for the refractive index of natural sea water. Even though the largest percentage of salt in the sea is sodium chloride, the presence of other significant ions such as magnesium and calcium in natural sea water results
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