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I need an air moisture meter and possibly a thermometer in one. Answered

Good day,

I am trying to find a moisture and temperature meter (possibly in one). It will be a used in a beehive. During the winter the bees cluster together to keep warm. Warm air rises up and gets in contact with the cold ceiling. It cools off and releases moisture. The water then starts dripping down and creates a mess of wet bees and mold. Opening the hive during the winter is not recommended till temperatures get back over 40F. Proper ventilation is possible to achieve through the design of the beehive but i would like to know the level of moisture and temperature if i was to just walk next to the beehive. I have seen a few instructibles about moisture meters but they are geared more toward soil moisture. I need it for the air. The system could be powered by a rechargeable battery and a solar panel - i can take care of that myself.

Thanks.

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JJ Slabbert

3 months ago

Air moisture is called humidity. Humidity can be absolute or relative. If you have relative humidity and temperature, you can calculate the absolute humidity or vise versa. The bosch BMP280 can measure all three

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THE WAR OFD

3 months ago

It always seemed accurate, but as I go to buy some thermometer/hygrometers for animal cages I got out my digital infrared thermometer which I consider a good reference (as it consistently matches both another similar digital and my Kodak Process thermometer.)
I measured the body of the Acurite, front, rear, top, bottom; also measured the area around it. All those readings were consistently about 80.4ºF with my reference thermometer. The Acurite was reading about 76ºF. That is too far off for it to be useful as a thermometer. Given that, how can I trust it to measure humidity? I don't even have a reference to compare for humidity (salt trick aside.)
The body is made of apparently sturdy plastic, the display is large, pretty well laid out and easy to read if there is some light reflecting off the surface. It's powered by a single AA battery -- I put in Eneloop™ AA when it came, and it has been operating since. The one I have has a magnet on the back that attaches it firmly to a metal (magnetic) surface -- so both the display and body I consider well thought out and executed.
I would not recommend this product because it has proven to be in-accurate so there is no point.
EDIT: I looked this up on Acurite's website where they post specifications for it:
Indoor Temperature Range: 32º to 122º F, 0º C to 50º C
Temperature Accuracy: up to +/- 4°F; Learn More
Indoor Humidity Range: 16% to 98% RH
Humidity Accuracy: +/- 5% RH
My results show that it just about matches that accuracy in use. Given its pluses, it may not be such a bad unit after all...but 4ºF is a pretty wide allowance for a lot of uses so it may be better for casual use (haha, how can that be defined?) like guessing at the temp/humidity in your living room? But I would still not select it for even fairly critical applications.
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petercd

4 months ago

Insulate the hive roof so that the inside doesn't radiate cold to the interior, perhaps a thermal barrier on the outside.

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Downunder35m

4 months ago

You can still get old school gauges for terrarium use.
No electricity required, just a matching hole to put it in.
Then there is all sorts of cheap "weather stations" with a sender unit for outdoors.
Just place inside and read the results from the indoor unit.
Some wired ones exist too, just check Ebay for starters and you might find what you need quite cheap.