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Old 07-16-2012, 01:37 PM   #1
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Salinity testing

To those just getting started with SW tanks. Please do not trust the hydrometers. I had three of them. Each were giving me different readings on the same tank. I know they are cheap but spend the extra money and get you a salinity refractometer. It is very accurate and save you a lot of grief.
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Old 07-16-2012, 02:05 PM   #2
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I totally agree. Here is the one I have, cost me like $30 and is worth every penny. keep in mind the smaller the tank the bigger impact the inaccuracy will have.

Salinity Refractometer 0-10% ATC Aquarium Salt Water | eBay
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Old 07-16-2012, 02:59 PM   #3
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Let me clarify that I do use a refractometer. But for those that do use a hydrometer here is a good link.

Temperature Corrections for Hydrometers by Randy Holmes-Farley - Reefkeeping.com
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Old 07-16-2012, 05:21 PM   #4
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How is it that hydrometers are so inaccurate lol
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Old 07-21-2012, 03:10 PM   #5
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There are 2 types of hydrometers and the inaccurate ones are the floating needle style. The float inside the hydrometer will trap small bubbles giving a false reading. Almost always. They are fine where accuracy is not important like the S.G of a car battery. The other type are quite accurate and are the floating bulb hydrometer. The entire bulb floats higher or lower depending on the S.G. Unfortunately I have never seen one scaled for aquariums. The ranges we are interested in are about 1/4 inch or less on the scale. That
Makes it hard to tell the difference between 1.02 and 1.03.
Refractometers come in a variety of scales including the aquarium range.
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Old 07-21-2012, 03:17 PM   #6
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Quote:
Originally Posted by Ingy
There are 2 types of hydrometers and the inaccurate ones are the floating needle style. The float inside the hydrometer will trap small bubbles giving a false reading. Almost always. They are fine where accuracy is not important like the S.G of a car battery. The other type are quite accurate and are the floating bulb hydrometer. The entire bulb floats higher or lower depending on the S.G. Unfortunately I have never seen one scaled for aquariums. The ranges we are interested in are about 1/4 inch or less on the scale. That
Makes it hard to tell the difference between 1.02 and 1.03.
Refractometers come in a variety of scales including the aquarium range.
Awesome thanks for explaining it
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