Thermometer Guidelines from the National Turkey Federation. Proper Placement An important part of using any thermometer is the proper placement in the turkey. Insert the thermometer 2 1/2 inches in the deepest portion of the turkey breast or into the inner thigh near the breast. Make sure the thermometer does not touch a bone. Meat Thermometer, Habor Instant Read Thermometer Candy Thermometer with Swiveling Head and Large LCD Screen for Christmas Thanksgiving Turkey Kitchen BBQ Gas Grill Smoker by Habor $ $ 11 99 Prime. For turkey breasts, place thermometer in the thickest part. For whole turkeys, place in the thickest part of the inner thigh. Once the thigh has reached °F, check the wing and the thickest part of the breast to ensure the turkey has reached a safe minimum internal temperature of °F throughout the product.