The Urban Thermo-Hygrometer MEDIUM is a digital thermometer and hygrometer with a large display and a probe for measuring temperature and humidity. It is ideal for use not only in the grow room. The humidity measurement range is 10% RH to 98% RH (at 60% ± 5% RH). The temperature measurement ranges are 0 to 60 °C / 32 to 140 °F (indoor temperature) and -40 to 70 °C / -40 to 158 °F (outdoor temperature). The measurement accuracy is 0.1 °C for temperature and 1% RH for humidity. The accuracy of the temperature measurement is ± 1 °C and that of the humidity measurement is ± 5%. The update frequency is 1 second. The thermo-hygrometer is operated with 1x AAA battery (not included).