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Old 06-05-2007, 10:05 PM   #1
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Hydrometer Not Working

My hydrometer give a different reading every time. Is it possible that its defective? Will having the wrong specific gravity at this point be a big deal? I haven't begun to cycle the tank yet. Water has been in there for just two days so far. I have 40 lbs. of live rock.
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Old 06-05-2007, 10:35 PM   #2
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Hydrometers are notorious for being unreliable. If you insist on using one, make sure you rinse it with FW after each use or better yet, rinse it with Ro/DI water and let it sit filled over night before dumping it. Then, take it to the LFS and have it lested against a refractometer so you know just how accurate it really is. When using it, fill it to the line and then make sure you tap it against a level surface several times to remove any air bubbles as these can effect the reading.

For best results, I recommend you invest in a refractometer so you get much more accurate readings. You can find them for pretty inexpensive on several online sites. It is a tool you should seriously consider.
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Old 06-05-2007, 11:51 PM   #3
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Take Lando's advice. Get a refractometer.
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Old 06-05-2007, 11:54 PM   #4
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Thanks to both of you! I ordered a refractometer. I'm taking this one step at a time.
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Old 06-06-2007, 11:22 AM   #5
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On a side note, when I first got my hydrometer (I later tossed it for a refracto) and was mixing water out of the tap...cold water...I was not getting any type of ready, so the temp of the water matters....
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Old 06-06-2007, 10:11 PM   #6
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Quote:
Originally Posted by blackhorse
Thanks to both of you! I ordered a refractometer. I'm taking this one step at a time.
Good move
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Old 06-08-2007, 07:57 AM   #7
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Actually, some hydrometers are very accurate (http://www.wetwebmedia.com/ca/volume...mpressions.htm) and some refractometers are alleged to be consistently wrong because they are designed to measure salt water (a mixture of NaCl and water) not seawater.
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Old 06-08-2007, 08:14 AM   #8
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I understand what you are saying and your article was great but my experience with hydrometers was not very good and I`ll stick to my refractometer.
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