Accurate hygrometer

[FreeUrMind]

Hey icmag i was reading for great plants i need to dial in my environment So were do i get an accurate hygrometer because i bought 2 and they both
Give off different temps and humidty readings..I bought digital one's

 

[Phaeton]

I use Acu-Rite and Oregon, two each. With all the sensors and bases (dual temp and RH readouts) put in a box together the reading are within 2% of each other, both temperature and relative humidity. Out in the yard the readings match the area weather report. I have mechanical gauges on a pair of wall clocks and both the temp and RH vary more than 15%. I trust the digitals much more.
A few have gone sour after a few years use, the readings go wonky with age.

If two sensors are ten percent apart then there is a problem, but it takes at least three sensors figure which number is best. Unless there is a nearby weather station with hourly reports available on line. With the sensors in the breeze outdoors the numbers should be close.
I live within a half mile of a station that gives hourly reports, making relative humidity relatively easy to calibrate.

The photo has the base station hanging under one light with the sensor under a light across the room. The sensor's high and low for the previous 24 hours are the middle numbers. The top two numbers are current sensor, the bottom is current base. Another sensor is in the canopy with its base attached to the side of a container. A a third sensor is in the ambient airflow with the base station readout next to the computer monitor I am using right now.

Overkill at times but when new lights and fans are installed the more information the better.

 

[Aotf]

You could use a psychrometer to make a baseline for future readings or just to check what the actual temp humidity is...

We used to use these in the field, where you wet a bulb and whip a little thermometer over your head to get a temp and then compare to the "dry" bulb and basically the difference between the two temps, using psychrometer table or sliding scales could calculate your RH, realtime, whatever your location, etc etc.

Now they make them digitally and its basically a lost art to calculate RH on your own, but possibly worth looking into.

Small mechanical ones can still be had for half the cost of a quick meal.

Good luck.

 

[Floridian]

I swear Aotf when I read the first couple sentences about the psychrometer I really thought you were making a joke and a pretty good one lol!I mean cmon a psychrometer haha,that cant be for real..I'm pretty much a psycho sumthin,just haven't figured that one out yet lol!Don't take this in any other way except for what was intended,It's just that damn the overkill or I guess I should say killer technology has just become so prevalent!Good advice bro the only thing I can add after running sealed rooms for some time is to get the ambient readings go towards the middle of the canopy maybe an inch above and use some kind of shading device so temps and RH don't become skewed from being in direct lamplight.Psychrometer lol man that's too cool sounds like a device to measure how crazy a motherfucker really is lol!'im sorry mr. Jones but you psychrometer readings are off the chart..I think we need to bring in more mental health experts lol"Forgive my own mental health issues bro

 

[DocTim420]

Test em. Back in my cigar aficionado days I would use the salt method to verify the accuracy of those tiny hygrometers in my humidors.

I bet both or slightly off.

 

[FreeUrMind]

Great post doctim420 I will try this method. I was thinking I could use a boveda 62% pack and do the same
I have 3 to calibrate thanks

 

[eric2028]

Test em. Back in my cigar aficionado days I would use the salt method to verify the accuracy of those tiny hygrometers in my humidors.

View Image

I bet both or slightly off.

The method I use to calibrate my sensor push device along with their free app. Works great and records all data for a month. Worth the 50 bucks on amazon.

 

[Guest]

I bought some of the small ones about the size of a match box off amazon. I also have a Acurite wifi setup with two remote sensors. I put all of them in a mason jar with a couple Boveda 62% packs and let them stabilize over a few days. I had them taped together so I could identify each one and took a pic. Pulled them out and marked them plus or minus to indicate how close they were. All of them are within a few points. The acurite I calibrate using the software on my PC and can monitor those by the web anywhere.

 

[FreeUrMind]

I did the salt test hygrometer read 76%

 

[DocTim420]

1 basis point off, not bad. I have seen as low as 63% and as high as 82%...almost a 20 point spread. The one that read 63% was a pretty petite one (from an expensive humidor that I got as a gift), lol and the ugly ducklings (no gold trim/rings no fancy numbers) were always dead on.

I too use an Accurate that can be calibrated--but a little lower tech version.

https://www.acurite.com/acurite-01083m-pro-indoor-temperature-and-humidity-monitor.html

The numbers on the $9 cheaper models seem to fade sooner than most...at least in my little world. So far, so good on this paticular model. I place on the wall where the light shines on it and I imagine my higher than average UVb lamps may have something to do with the numbers fading away--but after 1 year of operation, still looking good.

 

[Aotf]

I swear Aotf when I read the first couple sentences about the psychrometer I really thought you were making a joke and a pretty good one lol!I mean cmon a psychrometer haha,that cant be for real..I'm pretty much a psycho sumthin,just haven't figured that one out yet lol!Don't take this in any other way except for what was intended,It's just that damn the overkill or I guess I should say killer technology has just become so prevalent!Good advice bro the only thing I can add after running sealed rooms for some time is to get the ambient readings go towards the middle of the canopy maybe an inch above and use some kind of shading device so temps and RH don't become skewed from being in direct lamplight.Psychrometer lol man that's too cool sounds like a device to measure how crazy a motherfucker really is lol!'im sorry mr. Jones but you psychrometer readings are off the chart..I think we need to bring in more mental health experts lol"Forgive my own mental health issues bro

lmao

bro, I used to use all kinds of field instruments for environmental measures, timber cruising, etc..things like, altimeter, aenometer, clinometer, right...

one time my girl was sitting on the couch and I asked her to hand me my clin-o-meter and she mis-heard me and thought I was asking for lady parts, lol, her psychrometer readings at that moment were off the fucking chart.....

 

[DocTim420]

lol...I must have missed that, "psychrometer". Reminds of the hot fade of the mid 70s called "mood rings". Remember those? They would change colors depending on the temperature of the finger. Crazy fade us old fuckers went through (but, it did get me laid...more times than not--I argued the color of the stone was more "true" than not, lol).

On edit: Of course sharing a few lines of blow and popping ludes had nothing to do with the "mood change'.

 

[Floridian]

Haha how could I forget mood rings growing up with Root Boy Slim and his shows in the DC area.Root Boy Slim and the Sex Change band,he made mood rings popular in the late 70's." Whole stole my mood ringI"I believe it was lol.Hard to believe a couple diluadids and some drinks did that guy in it's so crazy unfortunate.His girls the Rootettes were devasted lol.

 

[Chilly Willy]

I had to buy one to use for clones, to make sure it was 100% humidity, used a spray water bottle. Then I needed it for the grow, found out where I live I did not need to do anything. But in winter I used it to find out that the cooler temps outside affected me indoors and I had to add humidity. So it is worth buying one, mine cost about 100 bucks and is digital, the one the forrest service use to use.

Mine was yellow, but that was back in 2006. The cost is a little higher but shop around and get a little off. I looked around a bunch, and found these are the best for the money for what they do.

https://www.toolexperts.com/thermometer-hygrometer-fast-digital-humidity-temperature.html?gclid=EAIaIQobChMIwf_Qz56j1QIVpxbTCh286QI4EAkYByABEgKJ2_D_BwE