We are offering here the RTDs Themocouples that are what measure the temperature of the grill. Each grill will have either an RTD or a thermocouple, depending on whether or not they have WiFIRE capabilities. They are both very sensitive to both temperature and tampering, so you want to make sure people do not touch them while using the grill. Thermocouples are best for working at high temperatures. New manufacturing techniques have improved the measurement range of RTD probes. The RTDs are special resistors whose resistance value changes with temperature in a known way. RTDs Themocouples are very effective.