FYSZ02 is a Honeywell digital temperature controller used to maintain the temperature of an area or an appliance. It is designed with an LED digital display that shows current temperature, set temperature and adjustable parameters. It is designed to work with three types of thermostats: Low Voltage, 2-wire Low Voltage, and Single Stage thermostats. The FYSZ02 digital temperature controller can also be equipped with various temperature sensors, including digital thermistors, thermocouples, and resistance temperature detectors. It is capable of controlling the power of external heating elements, fans, and other devices, including refrigeration and air-conditioning systems. It is highly reliable, accurate and durable and can stand up to demanding industrial quality demands.