calibrate your hygrometer

Discussion in 'Incubating & Hatching Eggs' started by Settin'_Pretty, Feb 10, 2008.

  1. Settin'_Pretty

    Settin'_Pretty Songster

    Feb 10, 2008
    North Georgia
    Hi all, been reading for a long while, but decided to sign up to share something I found tonight that may be helpful.

    To calibrate your hygrometer you will need table salt,
    a see through container such as a Ziplock baggie,
    and a small shallow open container, like a bottle cap.

    Place a teaspoon or so of salt in the shallow container
    and add a few drops of water to get it wet.
    You don't want to dissolve it, just get a good damp pile of salt
    in your container. Remember, you don't want a salt water solution,
    just damp salt. Place the shallow container in the baggie
    along with the hygrometer.

    Seal the baggie with some air trapped inside
    (so it is not tight against the hygrometer) and let it sit.
    Allow this to stabilize for at least 6 hours (don't rush it).
    After it has stabilized, check the hygrometer reading without
    opening up the baggie. It should be exactly 75%.

    If your hygrometer doesn't read 75% after calibration
    then you have 2 choices. First you can remember the deviation
    of y our hygrometer. If it read 80% then you are 5% off and have
    to subtract 5% from whatever it reads. The second option is to adjust
    the hygrometer if your model allows for this. Some hygrometers
    have a dial on the back or side that can be turned to adjust the
    unit to 75%. If yours doesn't have this, then go with option 1.​
  2. silkiechicken

    silkiechicken Staff PhD

    Sounds good, never tried it myself though as I don't have a hydrometer! I'm sure it will be helpful to those who have questionable ones.
  3. speckledhen

    speckledhen Intentional Solitude

    I've posted links for that, but I'm sure they're on page 100+ by now, LOL. I have found it very useful to do. Sure beats guessing, doesn't it?
  4. EmptyNest

    EmptyNest Songster

    Jan 7, 2008
    SW Iowa
    Thanks for the info - I tried this last night and found mine was reading 6% too low. I'll know now to adjust accordingly.
  5. Bantymama

    Bantymama Songster

    Apr 19, 2007
    I tried it also last night and mine was at 59%. I think i will just toss it out.

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