- Thread starter
- #12,241
InTheShed Grows Inside & Out: Jump In Any Time
Snaop
I have just received a new one that has a remote sensor thing for “outside” and “inside” monitoring (so i can put that in the tent and have the monitor beside me
).
I’ve kept the main unit and the remote sensor side by side on my desk for 3 days. The “in” and “out” conditions have read consistently different the whole time. The out sensor consistently registers 3-5% higher in RH and 2.3ºF lower in temp. This is with the 2 units side by side
so they should be the same 
. It wasn’t super-cheap either. I think I’ve figured out using the accurite that the outside RH is close to correct and the most important one for the tent. Still seems like a big discrepancy in something that is sold as one unit!
SNAP!noticed that there is a rather large discrepancy in the RH on the brands of meters. Check this out:
20190404_090532.jpg
Hygrometers...who to believe?
- InTheShed
- Today at 4:52 AM
Both brands are pretty consistent with each other, but not with the other brand. Which one is correct? I'm going with the small ones, because after a month in a jar with a B62, they read 62%. When I'm done with these harvests I'll run a salt test on the Thermapro's and see if they actually are off by 4-5%.
I have just received a new one that has a remote sensor thing for “outside” and “inside” monitoring (so i can put that in the tent and have the monitor beside me
). I’ve kept the main unit and the remote sensor side by side on my desk for 3 days. The “in” and “out” conditions have read consistently different the whole time. The out sensor consistently registers 3-5% higher in RH and 2.3ºF lower in temp. This is with the 2 units side by side
so they should be the same . It wasn’t super-cheap either. I think I’ve figured out using the accurite that the outside RH is close to correct and the most important one for the tent. Still seems like a big discrepancy in something that is sold as one unit!- Thread starter
- #12,243
You would hope they would calibrate the expensive ones!
CraZysWeeD
Well-Known Member
An instrument is never accurate. You can have two of the most expensive ones and calibrated with the same environment and still get different readings. We often use double instruments when measuring pH of drinking water it's easy to tell if one goes haywire but they never tell exactly the same.
- Thread starter
- #12,245
Well that's reassuring!
Yeah - figures. I have 4 all sitting together now and they’re all different. I figured one or 2 points on the RH was understandable - but 5% difference was a bit disconcerting. I think I have it worked out tho - enough to keep things in the ballpark.
- Thread starter
- #12,247
After I salt test them I'll mark them so I'll know how far off they are, though I'm sure it's not a straight line difference at all temps and moisture levels.
How do you do this salt test thing you’re talking about? I sense another pictutorial in the works 
I have noticed that this is true
- Thread starter
- #12,249
LOL! You take a bottle cap from something like a jam jar, fill it to just below the rim with salt, then put in enough distilled water to turn it to slush without it spilling. That and the meter(s) go in a ziploc bag on the kitchen counter out of the sun. Leave it there overnight (I don't like to rush these things), and in the morning it should read 75% RH.
Calibrating Your Hygrometer - Cigars International - Cigar 101
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Hey y’all
- Thread starter
- #12,251
Howdy AW!
Hard to feel sunny and bright when the skies insist on being grey and wet. I'm really ready for the sunny skies to return to my N. Cal neighborhood.
- Thread starter
- #12,253
I hear ya BL!
I hear ya BL!
Finally turning the corner here in SE TN. Next 15 days it's supposed to be between 70-80 and only 3 days of forecasted rain. We got soaked this winter. I think we had 3 straight weeks of rain a month ago. They had the dam wide open and the water in the lake/TN river was still about a foot from cresting the banks.
That’s crazy, I wonder how far outta whack my cheap Chinese ones are......
Always something interesting in being talked about here.
- Thread starter
- #12,256
Glad you didn't get flooded! We had a grower here from Houston who hasn't been heard from since Harvey soaked the place.
Hive mind!
Do the salt test on them.
Baked much 
Lol gosh....
yeah I may try that salt test, it’s easy to do and now I’m curious
- Thread starter
- #12,258
You just have to know how to sleep!
Double entendre’Bait ball:
"a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators."
CraZysWeeD
Well-Known Member
The closest you can get to reality is doing the math on a few meters and calculate the medium value over the number of meters. I'm sorry to say it but its the closest u can get to reality.