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Unread 01-22-2011, 10:43 AM
Paul Mc's Avatar
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Join Date: Aug 2010
Location: St. Louis, MO
Posts: 3,791
Default Looking for a good hygrometer/thermometer

Ok, so I must be getting serious about my orchids now. I'm wanting to find a relatively inexpensive but accurate hygrometer/thermometer to measure the relative humidity and temperature of the places where my orchids are located to ensure I'm giving them what they really want.

But, after extensive reading (which I believe a lot of it is rather biased), I have yet to find one that would suit my purposes that is around or below $50. I just can't believe that one doesn't exist. Most of the ones I've looked at people are claiming that the humidity readings just aren't accurate, but of course they claim that the $150 and above range is.

Can anyone direct me in a good direction for a relatively inexpensive but good hygrometer/thermometer?
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Unread 01-22-2011, 11:18 AM
Ray's Avatar
Ray Ray is offline
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Join Date: May 2005
Location: Buckingham PA
Posts: 6,456

Paul - look in the "Miscellaneous" section of our store. We resell a reasonable-quality hydrofarm hygro-thermometer for only $22.
Ray Barkalow, Orchid Iconoclast
Using science and logic to advance orchid growing
Your best deal on orchid supplies: shop.firstrays.com
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Unread 01-22-2011, 04:11 PM
BobInBonita's Avatar
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Join Date: Jul 2010
Zone: 10a
Location: SW Florida
Posts: 320

I have two thermometers/hygrometers (one from Lowes and one from Target) that were in the $15 range (by memory). It's been a while since I purchased them. They both do temperature and RH, and both have max min functions.

I also have a Fluke hygrometer that was quite a bit more expensive (about $150) that we use in our homewatch business. It also does dew point.

Whenever I have compared them, all three have been within 2 degrees F. and within 3-4% RH. I have not done any sort of calibration curve comparing them through the temperature and RH range.

The cheap ones I'm comfortable leaving outdoors overnight to get a min temp. The expensive one, I treat pretty carefully to protect the sensor. If a cheap one gets sprayed or rained on accidentally, it's not a major issue. The cheap ones react MUCH more slowly to changes, especially RH changes, and have to be left in place for 5 minutes or more to equilibrate and give a stable reading. The Fluke is near instantaneous.

For the small (if any still exists) price difference, I think I'd go with Ray's hydrofarm unit. The brand is designed for gardening use, not normal household conditions, so is probably less likely to be damaged with normal orchid use.

Last edited by BobInBonita; 01-22-2011 at 04:14 PM..
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Unread 01-23-2011, 06:09 AM
billc's Avatar
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Join Date: Feb 2008
Zone: 6b
Location: The beautiful Hudson Valley of NY
Posts: 1,746

I've had the Hydrofarm Ray is talking about for maybe 2 years or so and it works fine. It's a good value.

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Unread 01-23-2011, 10:42 AM
Paul Mc's Avatar
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Join Date: Aug 2010
Location: St. Louis, MO
Posts: 3,791

Thanks guys, I will be purchasing that come my next paycheck!
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