The AllPoints Foodservice Parts & Supplies 51-1278 Thermocouple is a heavy-duty, 24" coaxial component designed for reliable temperature measurement in foodservice equipment. Operating within a range of 20-30 millivolts, this thermocouple is compatible with Johnson Controls and serves as a direct replacement for Star Mfg model 2J-Z4609. Ideal for ensuring precise temperature control, it enhances the efficiency and safety of your cooking appliances.