The General Tools EMR964HG Wireless Temperature Humidity Sensor is perfect for monitoring the conditions of any space from a certain distance. Simply place the wireless sensor in any room, space, or area, place the digital display screen wherever needed and monitor the temperature and humidity of the space, up to 90 feet. Its jumbo display allows the user to track in-depth readings while remaining easy on the eye. The EMR964HG allows the user to track minimum and maximum readouts and seamlessly switch between Fahrenheit and Celsius.