Ultrasonic Fogger Driver Where Do I Put The Hygrometer And The Thermometer In My Terrarium?

Where do i put the hygrometer and the thermometer in my terrarium? - ultrasonic fogger driver

I have two trees in a green wrought iron Exo-Terra terrarium, and I have a waterfall and an ultrasonic nebulizer, moss Substart for use with silk plants. I'm having trouble following Humidty 70-80%. I have links to what I included in the tank.

Cuba: http://www.exo-terra.com/EN/products/glass_terrariums_i.html

Waterfall nebulizer: http://www.exo-terra.com/EN/products/water_falls_i.html