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Thread: How accurate is the hydrometer in the dry cabinet?

  1. #1

    Question How accurate is the hydrometer in the dry cabinet?

    I have 3 different meters in my dry cabinet, 2 analog and 1 digital.

    Analog meter 1 reads 40%.
    Analog meter 2 reads 60%.
    Digital meter reads 70%.

    So which is accurate.

  2. #2

    Default

    By default, don't assume anything about the meter in the cabinet. My old POS "tropic dry"'s meter was 25% off. It was showing 50% whereas the real humidity was 75%. Had to calibrate it. My "Toyo Living" from Cathay seems very accurate - tallies with my digital meters. Some meters have a specified tolerance rating. Check yours.

  3. #3

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    can buy from outside a hydrometer?

    kui liu ah?

  4. #4
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    Default

    You gets what you pay for. Accurate hygrometers are damned expensive typically in the $500-15,000 USD range for an industrial grade instrument. Domestic units are nowhere near as accurate with 5-10% of full scale being normal depending on the type of sensor employed.
    The Ang Moh from Hell
    Professional Photography - many are called, few are chosen!

  5. #5
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    Default

    try the salt test too. helps to instill some confidence...

  6. #6

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    Quote Originally Posted by Diablo
    can buy from outside a hydrometer?

    kui liu ah?

    DIY stores have... abt $50, ntuc also have abt $30.

    As mention, i've also tried the salt test on on a digital hygrometer, give a 75% reading once it reaches equilibrium.

    Salt test procedure: http://www.cigardiary.com/storage.php3

  7. #7

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    Wow.. so much info.. Thanks guys.

    One more question... what is the best setting... 50%?

  8. #8

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    Quote Originally Posted by Cyberian
    Wow.. so much info.. Thanks guys.

    One more question... what is the best setting... 50%?

    http://www.totech.com/product/camera.asp?MenuID=11

    "... particular type of mold which grows under 20%RH"

    according to this URL, keeping %RH about 40 - 50 should be ok

  9. #9
    Member Papilio's Avatar
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    Default Hygrometer

    Looks like Ian and Karwing used the correct term "hyGROmeter" as opposed to "hyDROmeter". There is a big difference between the two meters.

    A hyDROmeter is simply an instrument for measuring the density of a liquid.

    A hyGROmeter is an instrument used to measure the moisture content or the humidity of air or any gas.

    This discussion refers to the Hygrometer in the dry cabinet, which functions to measure the humidity of the air in the cabinet.

  10. #10

    Default

    Hmmm.... interesting.. hydrometer and hygrometer... So where do i buy a HYGROMETER? Any particular brand?

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