Zoo Med Hermit Crab Home Dual Thermometer & Humidity Gauge, Glow in The Dark Allows precise monitoring of both temperature and humidity in your Hermit Crabs home Maintaining proper temperature and humidity levels will allow your Hermit Crabs to properly digest and metabolize food and facilitate shedding Helps decrease stress levels and prevent against possible illness and disease Unique Velcro backing enables easy removal Glows in the dark