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-   -   humidity meters (http://www.diychatroom.com/f2/humidity-meters-161392/)

Fix'n it 10-28-2012 10:38 AM

humidity meters
 
i am looking for one that is at least mostly accurate. and hopefully not expensive. walmart has some, but looking at all of them, some had different readings. so i thought i would ask before buying.

rusty baker 10-28-2012 10:46 AM

Are you wanting to test humidity in a room or moisture in a floor? 2 entirely different things.

Fix'n it 10-28-2012 11:06 AM

i want to place it in a room.

GBrackins 10-28-2012 04:09 PM

I have Springfield gauges in my office ..... if you can't find one you like why not make your own? http://www.ehow.com/how_4443876_make...ity-meter.html

Thunder Chicken 10-28-2012 04:20 PM

Get or make a sling psychrometer, and then use a psychrometric chart. That is how the meteorologists do it.

A psychrometer has two thermometers on it. One is a plain old thermometer, the other is a plain old thermometer with a bit of cotton wick slipped over the end.

When you wet the wick and blow air over it, it cools off (like a sweaty t-shirt). Like a sweaty t-shirt, the moisture cools you off if the air is dry and the moisture can evaporate. If it is really humid you don't get much evaporation and therefore don't get a lot of cooling. So having both a wet bulb temperature and a dry bulb temperature tells you something about the humidity in the air.

With those two measurements you go to a psychrometric chart, where the two temperatures intersect tells you your humidity (and a lot of other things).

http://en.wikipedia.org/wiki/Psychrometrics


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