Mini hygrometer inside with boost RH pack.. WAY OFF

I bought a 24 pack of mini Hygrometers.. started my cure and numbers just seemed off.. so i took a mason jar stuck a Boost 62% pack inside and i put the hygrometers in with it.. i have 4 jars each with 1 8g boost pack 62%... almost EVERY hygrometer is reading 49-51%.. two are at 44% and 1 is sitting at 61%. ONE!!! they are the cheap little square plastic ones. is this normal? for them to all be off by almost 10%? if so can i still use them and just make note the reading is actually 10% higher? or should i just take the loss?

Goabroa (12 Pack) Mini Hygrometer Thermometer, Digital Indoor Humidity Gauge Monitor with Temperature Meter Sensor Fahrenheit (℉)


these are the hygrometers i am using

Boston Brian said:

Is this normal? for them to all be off by almost 10%?

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Yep. Those things are junk. But if you have a few that seem calibrated to the same %, I'd assume that they are probably pretty close to accurate. Just use them all at the same time and see if they stay in synch.