What is the black thing in the humidor box? What should the hygrometer read? What if it's too humid or too dry in the box? Is there a way to adjust the humidity in the box?

i've got a lower end humidor. the humidifier and hygrometer attach to the inside lid by velcro, however the adhesive that keeps the velcro on the humidifier and hygrometer isn't holding. i'd like to apply more adhesive, but wondering if there's any i should stay away from or a particular safe one to use.

Cohiba Cigars

What should the hygrometer read? If it's too dry or humid, can one alter the humidity? What are the little black things located typically beside the hygrometer?

Cigar Humidor Humidity

My hygrometer is reading about 77%, and I know it should be closer to 68-72%. I don't know how to make it lower though.

Travel Cigar Humidor

I have a cigar humidor i got about a week ago. I filled the humidifier and charged the hygrometer. I also left a glass full of water to evaporate and season the wood. I have left it in my room at room temperature and my cigars are drying out and it seems like the humidor does not hold humidity. What exactly do i need to do to keep it humidified?