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  1. #1
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    wierd hydrometer readings

    2 diferent hydrometers 2 diferent readings
    instan ocean 1.026
    coralife deep six 1.024
    wich one is more reliable?
    It's not a hobby,it's an obsession.

  2. #2
    Senior Member tang_man_montreal's Avatar
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    Neither.
    Hydrometers are known to be off by sometimes several points. Your best bet would be to verify your reading against a known source (ie: refractometer) and go from there. Then you'll know if your hydrometer is off, and adjust accordingly.
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  3. #3
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    Vince is correct. If you really want to use a Hydrometer and have consistent and accurate results you would have to buy it from a laboratory supplier and be ready to pay a lot for it. then of course you would have to use it at the same temperature every time.
    At that price you would be better off with a refractometer.
    Rob

  4. #4
    Moderator Krugar's Avatar
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    Just to jump on the band wagon, I meticously maintained my hydrometer. I soaked it in vineagar to clean it every month, soaked it before testing and still my readings were off by 0.003. (i.e. mixing to 1.023 was in reality 1.026).

    I have a hydometer now & love it.

    Cheers!
    There is nothing so permanent as a temporary measure.

  5. #5
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    I took a water sample to my LFS they used a refractometer to measure th salinity. I found it off by about +0.001 SG. I just incorporate this error into my reading when I use the swing arm.
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  6. #6
    Moderator Krugar's Avatar
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    Check it again in a couple months, I found mine drifted out by quite a bit & it started bang on.

    Cheers!
    There is nothing so permanent as a temporary measure.

  7. #7
    Senior Member volitan's Avatar
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    just make sure you rinse it with warm water everytime your done with it and you should have a somewhat constant reading
    Derik...

  8. #8
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    another common mistake with floating hydrometers is not doing the test in the same size container every time filled to the same level. Like any lab test consistency is very important if results are to be trusted. The best and most reliably results come when the HIGH quality unit is used in a very tall slim beaker of about 1.5 inch DIA. The test of course is at the same temp every time with the beaker filled to the same level. The equipment is of course cleaned in fresh water after every use.
    Rob

  9. #9
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    I have a hydrometer from IO and i find extremely accurate. You just need to dip it in the water 3 times and make sure that the water level is at the line marked at the top of it. I bought a refractometer and it gave me the same reading as my hydrometer. The other thing is that you need to know is how to mix water water at the right salinity. If t6he water in your tank is at 1.025 and you always mix makeup water at 1.025 there is no real need to recheck your water because it's quite unprobeable of it changing.

  10. #10
    Senior Member pwall's Avatar
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    I agree with your statement that if you add water that is 1.025 to your tank that is 1.025, then it's quite 'unprobeable of it changing"....however, with that said, "an ounce of prevention is worth a pound of cure". I check mine anyways....
    Regards,
    Patrick.
    Ottawa (Orleans), Ontario
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