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Old 07-29-2013, 11:33 AM   #11
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The tools used to measure salinity are effected by the temperature of the water being tested. You will get a different reading at 70deg, as opposed to say 80deg, for the same water sample. "Temperature compensation" means exactly what it says... It tries to compensate for the temperature to give you a more accurate test.
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Old 07-29-2013, 11:54 AM   #12
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Get both. Use the hydrometer for a quick and ballpark number. If something seems wrong, for instance you dont have an ato and you think your hydrometer seems off use the refractometer. Alot of people have multiple tanks maybe you have a small amd large tank like stated before a smaller tank the levels change quickly and could possibly be fatal for your livestock. Use the hydrometer for larger tanks.
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Old 07-29-2013, 12:01 PM   #13
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They make digital refractometers that are simple to use for just a little more money. Well worth the investment for it being accurate and fast, without needing to look through a telescope.
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Old 07-29-2013, 12:09 PM   #14
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ok, i'm going to get a battery operated refractometer
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