TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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Mine are both off about 10 % for some reason (I'm assuming that my humidifier is correct). So, if I were you I would just buy another, maybe better, digital. Or, if you're really needing lots they have things that have a bunch of different probes for a ton of $$$.
The anilog ones can be calibrated, but then you still need a good digital to calibrate it. Then that is assuming the filiment that expands and contracs stays acurate too.
Wet bulb hygrometers are also known as Mason's hygrometers. They use the difference between a wet and dry thermometer to get humidity. I think they're around $30.
They're a pain because you have to use a chart or slide rule to figure out the RH and you have to keep the little resevoir filled with water. I don't know what the pluses are, there must be some or else they would have stopped making them.
They make outdoor digital hygrometers that are built to operate fully exposed. How do you think meteorologists do it? There are increasingly more consumer-level weather devices on the market as well. The cheap analog hygrometers you find at pet stores are pretty inaccurate in my experience; if you're willing to drop $30 or $40, you can find a weather-resistant one. Many of them even have wireless waterproof sensors that give readouts and record highs/lows on a base station that you keep indoors.
~Joe
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