3 to 4 seconds: the fire is medium heat, about 350--F. 4 to 5 seconds: the fire is medium-low heat, about 325--F. 5 seconds or more: the fire is low heat, 300--F. For a more precise measurement, use a special grill thermometer that clips onto the grill, or an oven thermometer that rests inside the covered grill.read more >>