I feel that monitoring Carnival Pass isn't accurat...

I feel that monitoring Carnival Pass isn't accurate by Butler Amusements. It does not let you know what was used for the amount of rides left. Some operators that scan the card is not knowledgable on how to use the handheld scanner. Sad to say the last ride my granddaughter 6(yrs) lined up for, was sent away because of lack of ticket fund. Not so happy with this new system!