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Model: JEDEW 4 Pack Hygrometer Thermometer Digital Humidity Meter Indoor/Outdoor Humidity Monitor Reptile Thermo-Hygrometer for Greenhouse Humidors Terrarium Jars, Fahrenheit (℉) /Celsius(℃) (4)
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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.
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.
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