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OfflineTerry M
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Registered: 06/18/10
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Accurate hygrometers driving me crazy!
    #14168551 - 03/23/11 06:27 AM (12 years, 10 months ago)

Maybe it is too much to ask, but can I get a guaranteed accurate to with +/-2 degrees over the range 75%-99%?

Here's the basic problem. Such a hygrometer would either have to have 2 adjustment screws, or be certified accurate by the factory with a bullet-proof return policy (in which case I am back where I started).

The salt test gives you the 75% humidity point, and the wet towel test the 95% point. But to calibrate to both simultaneously you must have a minimum of 2 adjustments. Anything in between these humidities, the range of which is ideal for mushroom growing, can be expected to be reasonably linear and accurate.

Does anybody know of such a beast for a non-absurd amount of money? I've tried 3 inexpensive (under $30) hygrometers, and all of them have accuracy problems.


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Liberté, égalité, humidité.


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InvisibleDoc_T
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Re: Accurate hygrometers driving me crazy! [Re: Terry M]
    #14168555 - 03/23/11 06:31 AM (12 years, 10 months ago)

Other than getting a good digital by luck, no.
It's not a "consumer task", nobody measures home humidity to 1% accuracy.
My envirolite digitals are more accurate (above 30%, all the way to 100) than the analogs I've tried.
But if you have the money for a good one, analog is the way to go.

Most of us end up using the mushrooms to read the humidity, I think.


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You make it all possible. Doesn't it feel good?


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Invisiblevirus1824
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Re: Accurate hygrometers driving me crazy! [Re: Doc_T]
    #14168687 - 03/23/11 08:04 AM (12 years, 10 months ago)

Yea same here. tried both digital and analog. analog is just not good with high humidities.
Digital ones break down (mine do at least) when it's constantly above 95%+ What Doc says. The mushrooms will tell you. I do it by looking and the feel.


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A weekend wasted is never a wasted weekend


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InvisibleDoc_T
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Re: Accurate hygrometers driving me crazy! [Re: virus1824]
    #14168692 - 03/23/11 08:06 AM (12 years, 10 months ago)

Quote:

virus1824 said:
Digital ones break down (mine do at least) when it's constantly above 95%+.




Oh, yes. Use it to dial things in, then take it out to room air after a few days

I killed one by leaving it in the greenhouse. :frown:


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You make it all possible. Doesn't it feel good?


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OfflineTerry M
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Re: Accurate hygrometers driving me crazy! [Re: Doc_T]
    #14172233 - 03/23/11 07:43 PM (12 years, 10 months ago)

Quote:

Doc_T said:
Quote:

virus1824 said:
Digital ones break down (mine do at least) when it's constantly above 95%+.




Oh, yes. Use it to dial things in, then take it out to room air after a few days

I killed one by leaving it in the greenhouse. :frown:




Me too! I want to leave mine in all the time, so I'm ordering another analog one right now. We'll see if I have any better luck with a "Polytherm."


--------------------
Liberté, égalité, humidité.


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OfflineTerry M
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Re: Accurate hygrometers driving me crazy! [Re: Terry M]
    #14210967 - 03/30/11 05:57 PM (12 years, 9 months ago)

I finally found an accurate one, and it doesn't cost an arm and a leg:

http://www.humidorhabana.com/product46.html

It's made is Germany, where they still know how to make quality products. I calibrated it at 99% in the heavy mist of my Martha. Then I gave it the "salt test." It was spot-on, at 75%!


--------------------
Liberté, égalité, humidité.


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Offlinek00laid
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Re: Accurate hygrometers driving me crazy! [Re: Terry M]
    #14210972 - 03/30/11 05:59 PM (12 years, 9 months ago)

ya ive done most of the tub-style grows w/o a hygrometer.
i dont think i'll need one when i set up my GH :shrug:


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AMU - AMU Q & A - MyVideo Teks!


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OfflineTerry M
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Re: Accurate hygrometers driving me crazy! [Re: k00laid]
    #14213431 - 03/31/11 05:37 AM (12 years, 9 months ago)

Quote:

k00laid said:
ya ive done most of the tub-style grows w/o a hygrometer.
i dont think i'll need one when i set up my GH :shrug:




Yup, I just go a little overboard sometimes. Okay, a lot! :grin:


--------------------
Liberté, égalité, humidité.


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InvisibleDoc_T
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Re: Accurate hygrometers driving me crazy! [Re: Terry M]
    #14213449 - 03/31/11 05:48 AM (12 years, 9 months ago)

Quote:

Terry M said:
I finally found an accurate one, and it doesn't cost an arm and a leg:

http://www.humidorhabana.com/product46.html




That's not bad.


--------------------
You make it all possible. Doesn't it feel good?


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Offlineblue_lotus
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Re: Accurate hygrometers driving me crazy! [Re: Doc_T]
    #14213461 - 03/31/11 05:56 AM (12 years, 9 months ago)

So analog is preferred over digital?  interesting...why?


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[18:25] < > yeah, my neighbor's cat has said the same thing before.  Only issue she's having is pinning.  She said it's taking forever....
[18:25] <-> thats cause ur neighbor is letting a cat do it
[18:26] < > cats bring something to the table, actually
[18:26] < > cat milk is a great addition to a casing, she says
[18:27] < > the only way to extract the cat milk is by pressing it's claws out and hissing at it while poking it in the rear
[18:28] < > just sit a cup underneath and it's almost automatic!


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InvisibleDoc_T
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Re: Accurate hygrometers driving me crazy! [Re: blue_lotus]
    #14213475 - 03/31/11 06:05 AM (12 years, 9 months ago)

More reliable long term.
Also, most digitals are for home use and not necessarily calibrated for 90+% and most analogs can be calibrated.
But I've had good luck with the digital hygrometers I've owned.


--------------------
You make it all possible. Doesn't it feel good?


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OfflineTerry M
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Re: Accurate hygrometers driving me crazy! [Re: Doc_T]
    #14213516 - 03/31/11 06:34 AM (12 years, 9 months ago)

Another thing I like about this Polytherm Hygrometer is that the tick marks of the scale are not to one degree. You kinda have to interpolate 5 degree intervals.  This is much more realistic than a hygrometer which displays to single degrees and yet doesn't have single degree accuracy.


--------------------
Liberté, égalité, humidité.


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InvisibleSillicybin
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Re: Accurate hygrometers driving me crazy! [Re: Terry M]
    #14214606 - 03/31/11 12:28 PM (12 years, 9 months ago)

IME, the #1 killer of digital hygrometers is SPORES.  Your "preciouses" release tons of them, which eventually clog the sensor.  Even thermal convection caused by the heat from a tube or CFL is enough to circulate them inside the FC/GH.

If you make sure the hygrometer/sensor is out of the container by the time any sporulation occurs, it will last a lot longer.


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Invisiblebiologys
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Re: Accurate hygrometers driving me crazy! [Re: Sillicybin]
    #14214639 - 03/31/11 12:36 PM (12 years, 9 months ago)

I only use a hygrometer to dial in for the first day or two, just til i get my polyfil tight enough to keep humidity up, but allow as much FAE as possible, once i get it set i let it sit for a day, maybe two to make sure no crazy swings then remove..

i also use a 'weather station' digital one, so it records high's and low's so I know exactly what my temp/humidity fluctuation is..


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OfflineTerry M
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Re: Accurate hygrometers driving me crazy! [Re: biologys]
    #14215464 - 03/31/11 03:23 PM (12 years, 9 months ago)

For some of the edibles I'm doing, humidity needs to be controlled in certain phases. It can't always be going "full blast." For example, my Maitakes will need a relative humidity of 75-85% for fruitbody development.


--------------------
Liberté, égalité, humidité.


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