Soda Pop advertising has always been and continues to be very competitve. Once given away to stores everywhere as a free item soda pop themometers that include vintage advertising are now a highly sought after collectable. Remember that reproductions abound and are worth only a fraction of the price of an original. While Coca-Cola, Dr Pepper, and Pepsi Cola thermometers were made in large supply other less nationally known soft drink manufacturers also produced thermometers.