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Feb 21, 2026 4:05 PM

4 Pack Hygrometer Thermometer Digital Humidity Meter Indoor/Outdoor Humidity Monitor 15% off $8.46

$8.46

$9.95

14% off
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Great for 3D Printer Filament Containers

https://www.amazon.com/dp/B07GR67...JKGHKZ402Z
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Great for 3D Printer Filament Containers

https://www.amazon.com/dp/B07GR67...JKGHKZ402Z

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Feb 21, 2026 4:18 PM
52 Comments
Joined Nov 2011
itsmiFeb 21, 2026 4:18 PM
52 Comments
customers mention accuracy, 466 positive, 308 negative
Feb 21, 2026 6:13 PM
11 Comments
Joined Dec 2014
cowherfamily08Feb 21, 2026 6:13 PM
11 Comments
Quote from itsmi View quoted comment :
customers mention accuracy, 466 positive, 308 negative
I have one in my AMS and it reads 15% humidity, the AMS reads 20%. I trust what my AMS says is the humidity inside the unit.
Pro
Feb 23, 2026 4:14 PM
10.8K Comments
Joined Mar 2018
WooHoo2You
Pro
Feb 23, 2026 4:14 PM
10.8K Comments
Quote from itsmi View quoted comment :
customers mention accuracy, 466 positive, 308 negative
I have a 4 pack of cheap ones similar to this (but not the same exact model). Out of the 4 there appears to be a 10% swing between the highest and lowest measurement and roughly 5% +/- over that of the outdoor RH my local news reports. As long as you were okay with a spitting distance measurement these should okay. Might want to 'calibrate' them using the outdoor relative humidity so you can get a guess of where your particular units read in relation.
Feb 24, 2026 2:16 PM
68 Comments
Joined Jan 2023
LavenderSeagull366Feb 24, 2026 2:16 PM
68 Comments
These get "stuck" after a while and stays at 10% / 20%. You can take them out, leave them to "rehydrate" overnight then they'll start working again.
Feb 25, 2026 1:45 AM
164 Comments
Joined Nov 2014
GeorgeP4063Feb 25, 2026 1:45 AM
164 Comments
My experience with these things is not good. *Maybe* 1 in 4 is somewhat accurate. In addition, the AMS Pro doesn't have a very accurate hygrometer (and they'll admit it if you ask). I ended up spending a few extra bucks and got an Inkbird hygrometer. Zero regrets.
Feb 25, 2026 5:05 PM
200 Comments
Joined Jun 2009
jay9055Feb 25, 2026 5:05 PM
200 Comments
30 day low price = $8.46

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