Things You'll Need
- Humidity gauge
- Cloth
Instructions
Select a spot for the humidity gauge. These devices stick to the glass wall inside your terrarium. Find a spot that is as far away from the water source as possible and low to the ground. The spot should also be along the back wall of the terrarium so that you can clearly see the gauge face.
Wipe the spot you've selected for your gauge down thoroughly to remove any dirt or dust.
Peel the wax paper off the back of the gauge, revealing the adhesive backing.
Stick the gauge to the spot you selected and press it down for at least 30 seconds. It should now be stuck firmly to your terrarium and it will tell you the humidity level of the environment via a small arrow in the middle that will point out the correct percentage, ranging from 0 to 100.