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QIANJINL Salinity Meter Aquarium Hydrometers Salinity Tester Hydrometer Saltwater Aquarium Pool Fish Tank Water Tester…

▶Material: The salinity tester is made of plastic, transparent, robust and durable structure. ▶Simple to use:Keep your hands clean, insert the hydrometer into the water tank or fish pond 15 cm (6 inches) below, avoid air bubbles adhering to the hydrometer during the test. ▶Precision:Accuracy can reach + (-) 0.002 specific gravity units, the highest accuracy is when the water temperature is 18-28 degrees.