The ZF Series Refrigeration Thermometer is offered by us that is a sensitive small device that aids to sense the temperature change of the refrigerant. If the heat level reaches a certain, um, level, the refrigeration mechanism kicks, and the refrigerant starts its trip through a maze of intestine-like coils, and the warm air is removed. The thermometers main task is to help people know the temperature inside the refrigerator so that people can easily adjust the temperature. ZF Series Refrigeration Thermometer is very effective.