[Thermometer and Hygrometer] - Indoor and outdoor thermometer and hygrometer with a diameter of 58mm are 2-in-1 tools for monitoring and controlling the temperature and humidity in the sauna room and can be safely used in the sauna. [Excellent Quality] - Aluminum alloy casing, plastic shell, plastic lens, PVC dial. The scale on the dial is clearly visible, resistant to high temperatures, and easy to read. [No Battery Needed] - This sauna thermometer is small, round, lightweight, easy to carry, battery-free, and requires no worry about moisture or high temperatures. [High Accuracy] - The monitor's thermometer and humidity sensors provide professional accuracy of ±1°F/°C and 2-3%. Air comfort indicators range from very dry to normal to humid, giving you the latest environmental changes. [Wide Range of Applications] - Suitable for sauna temperature display, home, living room, children's room, kitchen, office, cigar room, incubator, reptile enclosure, plant greenhouse.