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NOTE: 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.
- Fill the measuring cylinder with maximum 400 ml saltwater (water temperature = 25 ° C / 77 °F).
- The hydrometer should be dry and clean.
- Gently place the hydrometer into the water until it floats freely.
- Now read the specific gravity on the blue part of the scale of the hydrometer at the level of the water surface - NOT at the level of the meniscus, which is creeping higher at the edges!
- To avoid any distortion of future measurements, rinse the measuring cylinder well with fresh tap or reverse osmosis water to remove salt residues after each use.
Tropic Marin® High-Precision Hydrometer:
- Maximum deviation: 0.001 at 25 °C / 77 °F
- Scale from 1.021 à 1.031
- Resolution: 0.0001
- Recommended range: 1.025 to 1.027 (at 25 °C / 77 °F)
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