Measuring the specific gravity, or degree of salinity, in your aquarium water is a basic and important task you will need to carry out on a regular basis in order to ensure the well-being of your livestock. Red Sea’s hydrometer provides an accurate measurement of specific gravity, while the built-in thermometer ensures that the water being tested is at correct temperature. The patented design enables device to be permanently installed inside aquarium for continuous, real-time reading of salinity, in addition to regular periodic reading, while the bubble-proof casing allows for easy reading of results.

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