Jar sized Hygrometer/Thermometer

Sour Wreck

Well-Known Member
These are hygrometers that cost $1.10 ea. Free shipping.
(All 3 read well within reason in my tent, when next to my more expensive Accurite hygrometer nearby).

Who knows? So far, all these dollar hygrometers are still suspect to me. China makes millions of them. All 3 read within reason of each other (in my grow tent along side a more accurate hygrometer), but not so much now with the meter in lid thing. Still evaluating.
the sensor on mine is on the back side. i made another last night.

just went and looked. one is ready 62% and the other is 66%. mine are working fine and jars even seem to be pretty airtight.
 

Sour Wreck

Well-Known Member
jars appear to be losing a bit of the humidity, so i am going to glue the meters in.

made 2 more tonight. a brand new sharp razor blade is the cleanest method of cutting the lids.
 

grassy007

Well-Known Member
I've come to the conclusion that mini hygrometers made by China are a joke to begin with.

I have an Integra packet of 62% in the jar. After hours, the inside mini hygrometer is reading 54% and the mini hygrometer stuck in the lid reads 51%.

Useless toys. Only cost me $5 for three of them.
 
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vostok

Well-Known Member
76777.jpg
here's mine about 2-3 years old now

I got the gauge local and simply inserted into the Chinese cookie jar lid

is junky as but works well

flip open the back to re trim the gauge

I avoid glue as it will impart an after taste

that won't go well with my organic weed ..lol

good luck

ps bic is for scale
 

grassy007

Well-Known Member
You got lucky if it reads accurate, compared to a reliable source. There are probably millions of mini hygrometers like these churned out. I guess I'm one of the unlucky bastards.
 

Sour Wreck

Well-Known Member
View attachment 4078839
here's mine about 2-3 years old now

I got the gauge local and simply inserted into the Chinese cookie jar lid

is junky as but works well

flip open the back to re trim the gauge

I avoid glue as it will impart an after taste

that won't go well with my organic weed ..lol

good luck

ps bic is for scale

nice... thanks for sharing.

aren't there some glues that would not leak vapor?
 

vostok

Well-Known Member
You got lucky if it reads accurate, compared to a reliable source. There are probably millions of mini hygrometers like these churned out. I guess I'm one of the unlucky bastards.
flip open the back to re trim the gauge find the tiny screw...

set the expensive hydro gauge next to the cheap ass

correct the dif with the screw

otherwize like ur prev post is always wrong ...

none say to do this
 

vostok

Well-Known Member
Im sorry but how does a glue.impart an after taste exactly?

What kinda glue you using.man
In most cases inserting a gauge into a plastic lid

can be easy done re ur prev post with drill and knife = easy

if glue is required cause you misjudged the insert size

a glue suitable for plastic maybe required

most plastic glues have some chem that stinks to fuck

as these chem glues dry by evaporation it may be several days before the stink is gone

its called outgassing..?
 
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vostok

Well-Known Member
nice... thanks for sharing.

aren't there some glues that would not leak vapor?

None yet!
The fumes from CA (super glue) are a vaporized form of the cyanoacrylate monomer that irritate sensitive membranes in the eyes, nose, and throat. They are immediately polymerized by the moisture in the membranes and become inert. These risks can be minimized by using CA in well ventilated areas. About 5% of the population can become sensitized to CA fumes after repeated exposure, resulting in flu-like symptoms.[24] CA may also be a skin irritant, causing an allergic skin reaction. The ACGIH assign a Threshold Limit Value exposure limit of 200 parts per billion. On rare occasions, inhalation may trigger asthma. There is no singular measurement of toxicity for all cyanoacrylate adhesives because of the large number of adhesives that contain various cyanoacrylate formulations.
(https://en.wikipedia.org/wiki/Cyanoacrylate)
 

Sir Napsalot

Well-Known Member
jars appear to be losing a bit of the humidity, so i am going to glue the meters in.

made 2 more tonight. a brand new sharp razor blade is the cleanest method of cutting the lids.
My favorite way to cut a hole in plastic is to break just the tip off a #11 X-Acto knife blade and use the back side as a sort of graver using a metal straightedge as a guide- you'll have to make several passes until you break through the plastic. I'm a master jeweler btw
 

Cold$moke

Well-Known Member
Because after the glue cures it should be relatively benign unless you eat it or smoke it lol

Lol theres lots more nasty stuff in the materials of your home.

Just saying. .... and yes i know you dont smoke your wall paint

Or the silicones and other sealants used in construction.
 

Sour Wreck

Well-Known Member
If i where going to cut more then 5

I would make a jig out of metal

And just use a drywall cutting roto zip bit :)

thought about doing that. wood jig and dremel drill style cutting bit.

however, the plastic lids i bought are a little fragile if you stress them.

this is what works best. a couple score marks and it starts to go through

 

grassy007

Well-Known Member
flip open the back to re trim the gauge find the tiny screw...

set the expensive hydro gauge next to the cheap ass

correct the dif with the screw
Most mini hygrometers are set at the factory and can't be adjusted by taking it apart. As for the round ones that have an adjustment knob, 17% of Amazon buyers of that item said its junk (won't calibrate). My cheapo square ones aren't reading correctly at all now. 62% Boost packet inside jar, mini hygrometer inside jar and it reads 53% overnight. You'd probably get one in a hundred made that read correctly over time. And if they initially DO read correctly like mine did, that accuracy won't last.
 
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vostok

Well-Known Member
its true I screwed some of the earlier cookie jar lids maybe 2 ?

but returned this time armed with the knowledge to get soft ...even flexible lids

that can cut with a boxcutter or razor above

in reflection I suppose the easiest safest glue would be Latex

the organic tree sap from the rubber tree used as carpet glue

if you don't mind the slight oder of Ammonia ..?

lol
 

vostok

Well-Known Member
Most mini hygrometers are set at the factory and can't be adjusted by taking it apart. As for the round ones that have an adjustment knob, 17% of Amazon buyers of that item said its junk (won't calibrate). My cheapo square ones aren't reading correctly at all now. 62% Boost packet inside jar, mini hygrometer inside jar and it reads 53% overnight. You'd probably get one in a hundred made that read correctly over time. And if they initially DO read correctly like mine did, that accuracy won't last.
Accuracy of my junky mini hygrometers..to me is acceptable within 10-15% ..12% being the most predominant? popular even

the real deal is the liltle batteries cost a damm bomb here

I've even tried to hook up other batteries

to the pisstake of my buddies... grimmm!
 
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