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Quality Importers HygroSet II Round Digital Hygrometer for Humidors
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- Easy-set calibration instructions
- Humidity accuracy +/- 2-percent from 20-percent to 90-percent
- Temperature accuracy +/- 1 degree
- 10 Second refresh rate
- Note: the hygroset ii round is not compatible with exterior mount humidor models
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Round Digital Hygrometer with Adjustment Feature - Never wonder if your digital hygrometer is accurate. The HygroSet II is the first digital hygrometer of its kind capable of being adjusted after calibration. Each click of the adjustment knob changes the humidity display (+ / -) by 1-percent.
Button cell battery included.
Note: Quality Importers HygroSet II Round Digital Hygrometer is not compatible with exterior mount humidor models.
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Bought this to keep in my guitar case.
I did the salt calibration method that everyone else on here is talking about. Seemed to work fine as it was at least within a one or two percentage points of 75%. However I was unable to adjust the hygrometer as turning the knob did not appear to affect the reading in any sort of consistent fashion, certainly not as described in the directions. Whatever. The reading was close enough. Unfortunately, when I removed the hygrometer from the bag and left it sit at room temperature for a while (I live in a dry climate) it was off by more than 10% (compared by my other hygrometer and weather station) meaning even if the adjustment knob did work it would still be useless.
My conclusion: It seems to be more accurate the more humidity there is. So, maybe it's fine for a humidor but it's no good for a guitar case.
Out of box, these didn't work. Calibration knob did nothing: didn't change read-out at all. There was also a 5 point difference on their read-outs. A bad sign.
So why am I only returning one? I ordered two at the same time: Amazon's return sheet only lists one to pack and return (and I am guessing that I'll only be receiving one), so I'll simply have to make a mental note on the one I'm keeping.
As with all these small ones - they're sensor is small - so it'll respond quickly when you open the humidor. So open it and check your reading. It's not critical - but open your humidor and watch the reading and you'll get a feel for how fast (or not) these compact hygrometers respond to the changing conditions.
Do note that most hygrometers are accurate within only a +- 5% value. So if you calibrate with a calibration pack - then you know you're spot on 70-80%. (usual salt based 75% calibration pack)
This isn't a particularly huge issue as mostly you don't want to exceed 70% (mold) but you're running 65% (like me) or 70% beads you'd do better calibrating against your beads as HF and quality beads are spot on in my experience. Just not KL as it's not consistent enough as a reference.
These have built in magnetic backs so they are easy to attach to a file cabinet, refrigerator, etc. for easy monitoring. They also include an adhesive backed slim piece of metal so you can stick the metal on any surface and then the device will mount using the magnet as usual.
All in all this is exactly what I was looking for. It's compact and does what I need it to.