Hewlett Packard-10BII Scientific Calculator

I was very happy when I first bought it. Compared to the 12C, it is simple for basic calculator functions as well as time value of money. I bought one along with several of my colleagues for a class we were taking. After the first year, parts of the numbers on all of our calculators seemed to disappear. HP decided they would replace some of our calculators and not others, depends who you get on the phone. Considering we all bought it at around the same time and they all broke down at the same time, they should honor all of our warranties or none of them.