RELIABLE AND ACCURATE: The internal thermometer and hygrometer provide reliable readings to control humidity and temperature for a comfortable and healthy indoor climate - not for a sauna!HIGH QUALITY AND NOBLE: The entire case including the base of the analog thermo-hygrometer is made of stainless steel, the dial is made of aluminum and the cover is made of solid real glass. This makes it not only durable but also elegantly designed!Ready to use: The temperature and humidity gauge is factory calibrated and ready to use. Use the screw for fine adjustment if necessary.Extra Large Display: Humidity and temperature are easy to read on the Thermo-Hygrometer thanks to the 12cm analog display. Colored comfort zones show you when ventilation or increased humidity is recommended!SUSTAINABLE AND ECO-FRIENDLY: This Thermo-Hygrometer is plastic free and requires no batteries. This not only protects our environment, but also saves subsequent costs!