The Weber iGrill Pro Ambient Sensor keeps a close eye on the temperature of the grill or smoker. Combine the Weber iGrill Pro Ambient Sensor with the iGrill 2 or iGrill mini to keep an eye on the temperature of the meat. The ambient sensor is equipped with a clamp. You place this on the grill of the barbecue. When the barbecue is too cold or too hot, you will receive a notification via the app on your smartphone.