For determining the specific gravity with a hydrometer in saltwater aquaria
Measuring and reading the specific gravity on the scale of the hydrometer will be easy with the new Tropic Marin® MEASURING CYLINDER. The high-quality plastic measuring cylinder is transparent, has a stable base and a spout. With a height of 36 cm (14 inches), it is ideally suited to determine the specific gravity using the Tropic Marin® HIGH PRECISION HYDROMETER. It is no longer necessary to switch off the flow pump for a measurement in the aquarium; just take the monitoring of the specific gravity outside of the tank. It is really simple!
The Tropic Marin® MEASURING CYLINDER is available as single item and as set together with the Tropic Marin® HIGH PRECISION HYDROMETER.
Benefits:
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Tool for determining the specific gravity in saltwater aquaria |
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Height: 36 cm / 14 inches |
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Content: 500 ml / 17 fl. oz. |
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Transparent plastic (PP – polypropylene) |
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Stable basis |
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With spout |
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Molded graduation |
How to use:
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.
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Fill the measuring cylinder with maximum 400 ml saltwater (water temperature = 25 ° C/77 °F). |
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The hydrometer should be dry and clean. |
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Gently place the hydrometer into the water until it floats freely. |
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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! |
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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. |
DO NOT CONFUSE: The Tropic Marin® HIGH-PRECISION ARÄOMETER, which is used in German speaking countries, has a scale with a green printing and the indication Dichte/density (see Difference between density and relative density).
We recommend different salinities for various tank types:
| Tank type |
Specific gravity
at 25 °C / 77 °F |
Salinity in ‰
(psu) |
| Fish only tanks (no invertebrates) |
1.023 – 1.025 |
ca. 31 – 33 |
| Reef tanks |
1.025 – 1.026 |
ca. 33 – 35 |
| Shrimps |
1.026 – 1.027 |
ca. 35 – 36 |
