Tropic Marin Hydrometer Set
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The salt content in saltwater is usually measured as specific gravity (also sometimes called relative density) and is one of the most important water parameters. Many tank inhabitants are sensitive to even minor changes of the water conditions. These should therefore be kept as constant as possible in the optimum range for each tank.
The specific gravity of natural seawater of 35 ‰ (psu*) is 1.026 – compared to water measured at 25 °C / 77 °F.
Our recommendation for aquarium water at 25 °C is 1.025 - 1.027 (depending on the tank type), which can be read in the blue part of the scale on the Tropic Marin High Precision Hydrometer.
The specific gravity is temperature dependent. With increasing temperature the specific gravity decreases. Therefore, the measured water temperature should be 25 °C / 77 °F to obtain a correct result. For an exact, reliable measure of the specific gravity, we recommend to use the Tropic Marin High Precision Hydrometer.