The Fast Response Thermometer & Humidity Gauge by Hermit Crab Tank Supplies is a crucial tool for pet care, specifically designed for hermit crabs. With an upper temperature range of 158 degrees Fahrenheit and operating humidity ranging from 10% to 99%, this device provides accurate measurements to ensure the well-being of your pet. The compact design, tabletop mounting, and lightweight construction make it easy to use and transport. Its black color and sleek design add a touch of style to your pet care routine. Powered by a single 1.5-volt alkaline battery, this thermometer and humidity gauge is a must-have for any hermit crab owner looking to maintain optimal environmental conditions for their pets.