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I bought a Walmart sale priced Igloo mini fridge for $80, added WILLHI controllers for temp and humidity, as well as a small humidity "pond fog machine." 

I'm not happy with the humidity control.

Ideas?

It seems to run way too often - filling the refrigerator with "fog" and water but not triggering the sensor. If I open the door and just let the sensor into the room, it stabilizes on room humidity just fine.

no ideas.  I have a mini fridge with a temp control but not humidity.  I have two small containers, one with a salt "mush" and the other with water, and they keep the humidity within a narrow range at any given temperature, but I don't have much control.  Just bought a mister to go in and will update on how/if that changes things.

At 55 degrees I can keep the humidity at about 65.

I wonder if I'm trying to keep the humidity too high at 80% on the meter.

I suggest you to use an ultrasonic cool mist humidifier instead. It works very well in my cave. I can keep stable humidity from 50% to 99% without problem.

What's that little thing in your hand?

A very small ultrasonic humidifier.. It works but haven't tried it yet in my cave but I have seen other caves with this type of humidifier.
There are many models but if you have space in your fridge, try to choose one with a reservoir big enough that you won't have to fill it every day. I can make almost a week with mine at 90-92% hum.

I'm looking at this one now. It sits on top of my water bottle.

Any links to favorite models?

This one