A thermometer is included with each Big Green Egg. If it finally gives up the ghost after many years of use, you could order the Tel-Tru Temperature Gauge. Place the dome thermometer in the lid of your EGG and you will know how warm it is inside without having to open the lid and lose heat. The Tel-Tru Temperature Gauge is available in 2 sizes and displays temperatures that range from 50°C to 400°C.