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The instant ocean Hydrometer has been used for decades with success and is the best of its kind. For super accurate readings that are always consistent and the most reliable , shop around for a refractometer , they can be found for as little as $30.00. Just 0lace a drop of water on the lens , look through eyepiece and you will get extremely accurate reading. Public aquarium and pet shops use this method. I found the hydrometer from instant ocean to read high more than low ...make sure there are NO bubbles stuck to indicator..wait a few seconds to minutes and tap body of hydrometer on a hard surface to dislodge any air bubbles. Good for now but if it is in the budget ...shoot for the refractometer. Waves & reefs Facebook youtube
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Bought it as a double check, now use it to check my premade salt water before I add it.
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Best quality product. Thanks,
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Fash shipping
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