Customer Rating:  
Summary: Works well enough, great for the price
Comment: I bought a couple of these to go in my basement because I joined a winter farm share and ended up with more storage vegetables than I ever imagined. I tested it in the fridge, the freezer, on top of the humidifier, and on a rainy day, and it seemed to work well enough, giving results close to what I expected. I can't say that it was 100% accurate, because honestly I'm not that picky, but it did go way down in the fridge and freezer, and went waaaay up over the humidifier, and seems to give accurate readings in the basement compared to the other one I bought. So, good enough for me!
Customer Rating:
Summary: It's simple and it does the job
Comment: It's simple. It looks nice. It will never need batteries.
This is a truly lovely hygrometer. I have no complaints.
You should calibrate it, either with a readymade calibration kit or a little bit of damp salt in a small container in a ziplock bag. (I read about that method on the internet, but I used a readymade kit. I have no way of knowing whether one is superior to the other. Theoretically they should give identical results.) (Calibrating it requires a screwdriver. Or possibly the edge of a dime would work.)
In this era of battery operated products that go obsolete or break within six months, here's a device that has no reason to stop doing its job, ever. Kinda freaks me out a little, but in a nice way. Recommended.
Customer Rating:
Summary: Small, not very accurate, but tough
Comment: This humidity gauge will require calibration straight out of the box. I used the humidity transmitter on my humidifier as a standard since it is only a month old and still accurate. An alternative method might be to use a steam bath (a boiling pot of water). Note that altitude does not matter since we're talking about "relative humidity." A steam bath will produce 100% relative humidity directly over the bath.
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Customer Rating:
Summary: Dead on accuracy
Comment: I have received this hygrometer and tested it yesterday using the salt in a sealed container method. You can research how to do this online.
I checked it after 12 and 24 hours and the needle was dead on 75% humidity as it should be.
Very accurate and very inexpensive. My only regret is that I only purchased one.
Customer Rating:
Summary: Handsome, works, precise to about 4-5%
Comment: This is a nice looking magnetic humidity gauge, I have four and am ordering four more. Side by side they read within 5%, which is accurate enough for most storage use. At $6 they are well worth it.
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