[Thermometer and Hygrometer]- Indoor and outdoor thermometer and hygrometer with a diameter of 58mm are 2 in 1 tools to monitor and control the temperature and humidity of the sauna room and can be safely used in the sauna. [Outstanding Quality]- Aluminum alloy housing, plastic housing, plastic lens, PVC dial. The scale on the dial of the is clearly visible, resistant to high temperatures and easy to read. [No battery needed]- This sauna thermometer is small, round, light, easy to carry, without battery , without having to worry about humidity or high temperatures. [High Accuracy]- The monitor's thermometer and humidity sensors provide professional accuracy of 1F/C and 2-3%. Air comfort items range from very dry to normal to humid, giving you the latest changes in the environment. [Widely Used]- Suitable for sauna temperature display, home, living room, baby room, kitchen, office, cigar, incubator, reptiles, plant, greenhouse.