Marathons indoor jumbo display wall mountable hygrometer will accurately measure a rooms temperature as well as humidity. It features a full calendar display including the day, hour, minute, and second. The hygrometer can be formatted to display either 12 or 24-hour time and has an accuracy average within 60 seconds per month. The operating temperature of the device is from 0C to 50C (32F to 122F) and measures temperature within the range of -50C to 70C (-58F to 158F). Marathons hygrometer has a temperature resolution of 0.1C (0.2F) and measuring range from 20% - 90%.