Clean a small area on the inside or outside of the habitat wall where you would like to measure the temperature. Be sure to choose a location that is easily visible. Peel the protective backing off the adhesive strip and press the thermometer firmly onto the clean, dry surface.
The recommended terrarium temperature for a hermit crab is 72-80° F (22-26° C). Consult a pet care guide to determine the proper temperature range for your specific pet.