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Refractometers have been proven time and time again to be more accurate than hydrometers or reagent test strips for testing urine
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SEAfractometer True Natural Seawater Salinity Refractometer Reef Aquarium 0-40pp glycerin in water press the button and readSEAfractometer NATURAL SEA WATER REFRACTOMETER FROM NATIONAL INDUSTRIAL SUPPLY A POWERFUL AND WELL BUILT REFRACTOMETER, AT AN UNBEATABLE PRICE! PERFECT FOR ALL MARINE ENVIRONMENTS (EVEN BRACKISH)! SEAfractometer *NOW a True Natural Seawater with a 0 40PPT range! * Perfect for brackish environments, as well as normal marine environments! * Optimized for the temperature of most marine tanks 25'C! * Incomparable QUALITY, ACCRUACY, SCALE RANGE,
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