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Old 12-05-2014, 07:35 PM   #1
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Different hydrometer readings

I have two different hydrometers, one made by fluval and one made by instant ocean. The fluval one is about a year old; the instant ocean one I just bought today. The fluval says my salinity is 1.023 and the instant ocean reads 1.027. What gives? :/

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Old 12-05-2014, 07:37 PM   #2
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Hyrometers are garbage, get a refractometer so you can take accurate readings.
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Old 12-05-2014, 08:53 PM   #3
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Hydrometers can be difficult to use. Air bubbles can get in there and really effect the readings. Make sure you knock all of the air bubbles out of the hydrometer by tapping on it to get the best results...but a refractometer will give you accurate readings.
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Old 12-06-2014, 01:45 AM   #4
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Best saltwater related purchase I ever made was a refractometer. My hydrometer was off by 0.04 which is a lot!
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Old 12-06-2014, 02:16 AM   #5
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Originally Posted by alyxandria View Post
Best saltwater related purchase I ever made was a refractometer. My hydrometer was off by 0.04 which is a lot!

Wait til you get an ro/di unit :p. But +1 to everyone on refractometers over hydrometers.


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Old 12-06-2014, 02:21 AM   #6
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I agree with what has been said so far and if I may suggest I found mine on Amazon for a pretty good price
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Old 12-06-2014, 02:38 AM   #7
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Brs still has their sale going, $25 for a refractometer and calibration fluid.


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Old 12-06-2014, 07:41 AM   #8
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Different hydrometer readings

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Originally Posted by BigRedsReefs10 View Post
Wait til you get an ro/di unit :p. But +1 to everyone on refractometers over hydrometers.


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Oh god I know. Life will be so much easier. Lol :p
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Old 12-06-2014, 08:52 AM   #9
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take a look at the Milwaukee MA887, it makes regular refractors look like hydrometers, lol self calibration and test all in a second
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Old 12-06-2014, 02:49 PM   #10
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I used a hydrometer for decades. A refractometer is with out a doubt a good investment, but you can make the old plastic ones work. Just calibrate the plastic one using a friends refractometer, then every time you use it, smack it on the counter once to dislodge air bubbles.


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