barcode scanner

My niece had visited me the other day and she excitedly told me about their educational trip. They went to the zoo and they also visited an ice cream factory. She animatedly told me all the stuffs that she saw. She loves the ice cream tour and she had mentioned a barcode scanner that monitored the number of ice creams produced. They were given an ice cream sample and my niece told me that her favorite ice cream flavor is now bubble gum.