1、WORKING RANGE: The indoor temperature range is ‑10‑50℃, the outdoor temperature range is ‑50‑70℃, and the humidity range is 10‑95%RH. 2、WITH 2 PROBES: This digital temperature humidity meter is equipped with 2 external probes, used to detect temperature and humidity, with high sensitivity. 3、WIDE APPLICATION: This temperature humidity monitor is suitable for aquarium, incubator, or reptile water tank, such as frogs, scorpions, snakes, hamsters, etc. 4、BATTERY POWERED: The digital monitor is lightweight and compact, and powered by 1 AAA battery (not included), making it easy to use anytime and anywhere. 5、COMPACT SIZE: The temperature and humidity meter has compact size and simple structure, buttons operation, convenient and fast, with strong practicality.