20 replies to this topic

[viewer6922]

do i get one? In my fruiting chamber, I understand I want 85% humidity, and the temps to be 80 degrees, do i want to use bottled water to soak my perlite in? Or add a bleach solution for the soaking?

[Hippie3]

cigar stores are good sources for a decent hygrometer .
no need for bottled water on perlite,
tap water is fine.
no need for bleach either.
bleach fumes harm the mycellia,
and are trapped in the chamber
so don't use it,
just use fresh out of the bag perlite,
it's very clean straight from the factory
and dispose of it [in the garden]
once it gets 'dirty'.
it's good for months in the chamber
or until the 1st occurrence of contamination
in that chamber,
at which point it should be replaced with fresh
after the chamber is cleaned.

[Mycolangelo]

petco in the reptiule section $5.00

[Hippie3]

those are useless
don't waste yer $5
far too inaccurate to be useful

[Gamera]

The main problem is that hydrometers that are reasonably priced tend to lose precision as they approach 100% humidity. Since we are usually concerned with humidity in the 85%-100% humidity range, the accuracy of the readings is a little suspect. That being said I got a digital one from a hardware store for about $40 and I use it, I just don't put too much stock in it. But the cheapo analog reptile hydometers are basically worthless at the humidities you are interested in.

[Pedestrian]

Some of the analog ones have worked fairly well (in my experience). Im not talking about the reptile ones tho.... most of the crap you get at these xxxxCO and xxxMART places are garbage. As hippie was saying the cigar store ones a farily decent.... You just need to calibrate them once in a while.... and if you can handle that they should work fine.

[python]

www.torka.com

get a hair type

[viewer6922]

cigar store it is...gee tanks, by the way, I was going there to get some 'robusto leaf cigar ahywho....

[altered_states]

get a hair type

Anything else is just crap.
For example
Look at 5 hygrometers at Lowe's or Petco...
Each will read a different RH.
And it's usually a large difference.
Don't be fooled by Oregon Scientific's higer price; they suck too.

Peace,
AS

[Lazlo]

Here's some nice hydrometers for a good price..

http://vwrlabshop.co...hcd2=1141102275

[reefer]

hygrometers - measure humidity in air

hydrometers - measure specific gravity or salinity in water

[SharkieJones]

Radio shack has em for 24.99.

[Lazlo]

Baaa Haaa! Better loose the link aye? lol! Wrong one...

[Lazlo]

WTF! Here's the right link. Thanks for catching that Reefer. I added the wrong link to favorites and pasted the wrong link here. Geeze!
http://www.cheaphumi...ode=hygrometers

[bub]

If you have about $230 lying around, get Extech's EXT-RH390 Precision Psychrometer which costs $180: http://www.extech.co...RH390Psych.html

The specs are:
Humidity: 0 to 100% RH
Temperature (internal): -4 to 140°F
Basic Accuracy: ±2% RH; ±1.8°F/1°C ...ridiculous

Than buy a 33% RH calibration solution bottle or 75% RH calibration solution bottle. They cost $40 each. I called them and they said that you can use those calibration solution bottles for years.


Extech makes other really good humidity devices, but most only go up to 90% RH. Their "Big Digit Remote Probe Hygro-Thermometer" is $50:
http://www.extech.co...450/445715.html

Humidity: 10 to 99% RH
Temperature: 14 to 140°F (-10 to 60°C)
Accuracy: ±4%RH; ±1°C/1.8°F

Got my prices from a Google search.

[farmerjohncc]

i bought a couple of these on ebay...glass front...and a magnet with a sticky on the back....remove the magnet and you will find the calibration screw...seems ok

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[farmerjohncc]

oh yeah...shipping included in the price..:-)

[Hippie3]

see http://archives.myco...ges/5/4829.html

[Lazlo]

Those are good hygrometers John. Good price too! heh