The Jumbo Display Thermo Hygrometer, Model 13309, monitors the temperature and relative humidity in storage and production areas, walk-in coolers, hospitals, pharmacies, blood banks, clean rooms, greenhouses, live animal production, such as broiler houses and hatcheries. This thermo hygrometer features a large LCD screen, is °F/°C switchable, stores and recalls minimum/maximum readings, has an option to set daily and hourly alarms. The external thermistor sensor with an extension cable features a probe holder for secure placement.