Grill-Per'fect Reusable Color Changing Temperature Sensor for Poultry and Beef. Per'fect for Pork, too! Per'fect for all outdoor and indoor grilling, stovetop cooking, oven and microwave cooking. Just insert into Poulty or beef ... wait 2 seconds... and remove. The color changing sensor indicates if your food is ready or not as show below. Available in the Beef Grill Per'fect or the Poultry Grill Per'fect.