Chat
RecommendedRecommended

Which hygrometer is more reliable?

JamaweedOPO
JamaweedOPOstarted grow question a month ago
Which of these two sensors has better accuracy? Or are both not reliable? I’ve been getting very different readings, with around 20% humidity difference between them
Solved
like
001100010010011110
001100010010011110answered grow question a month ago
You'd have to look up the specs from the manufacturer. +/- 5% is typical. I wouldn't buy anything with a higher +/- error%. Some of the less expensive ones are +/- 3%, too. so, of the typical ones you find, the 3% error are the better ones to get. These cheap devices work with a 'filament' or 'hair-like thing' that contracts in a consistent way due to RH levels. It's possible this just gets fucked up and it no longer works, or maybe you can re-callibrate it, if the device allows such a thing. Maybe hold the button down for 10s and that enters callibration mode? Need the manual to be sure. May or may not have the ability to do that, but some do. The good thing is you can probably tell which one is accurate without a 3rd probe, if it's off by 20%.. common sense will tell you which probe is fucked up. humidity will be stronger at the bottom. Someone is going to throw a fit i contradicted them, but it is not personal. There are two reason.. for one, humidity in the air is denser and settles toward the bottom.. it is also cooler near the floor or lower levels, which if absolute humidity is the same, then RH rises as the temps cool, because it is "relative" to temperature. Two reasons why you should expect higher humidty at lower elevation in any closed system. See ultraviolet.. nothing personal. If you get upset about being wrong, look inward and stop blaming external sources. Learn something instead of being obstinate and angry about it.
2 likes
Complain
Selected By The Grower
AsNoriu
AsNoriuanswered grow question a month ago
I noticed that fog hangs high in the sky, never covers ground, maybe thats why humidity keep on top of tent too ??? 😉
like
Complain
Hashy
Hashyanswered grow question a month ago
0
like
Complain
m0use
m0useanswered grow question a month ago
Put them both into a sealed jar with a few curing packs 55% or 62% rated and give them 12hrs to normalize. then you'll see how far off they are. Don't stack em and let it sit on its own. maybe turn the jar sideways to give more room. also tupperwear and suranwrap/plastic with elastics also works. I find the smaller stand alone ones are meh. they work for a bit "6m-2yr" till they don't and need replacing. The best one I have its part of my tent extraction fan. Ac infifity cloudline t4 or something. Older model from a few years back. Had a few stand alone ones and they all broke within 2years. clogged or oxidized, cleaning did not help.
1 like
Complain
Ultraviolet
Ultravioletanswered grow question a month ago
Humidity rises, the top of any tent will always be 20-30% rh higher at top than bottom. I've never had more than 5% difference between hygrometer at same elevation so something is wonky.
1 like
Complain