Check the listing for details. ATC-Portable Handheld Refractometer. Condition: New. Listed at 19.99 USD. The Portable Handheld Refractometer is a practical tool for measuring the salinity in water quality in fish tanks or aquariums. This compact device allows users to easily check the refractive index of the water to determine its level of salinity .Perfect for both hobbyists and professionals, this handheld refractometer provides accurate readings and is easy to use, making it a valuable addition to any aquarium maintenance routine.
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