Hewlett-Packard HP Prime
The Hewlett-Packard HP Prime is a graphing calculator with formula input logic. It has 51 keys, and touchscreen display. The power source is 4xAAA.
Using a colour touchscreen gives this calculator some of the features of a smartphone. An examination mode allows invigilators to disable advanced features. RPN logic available.
Note: An upgraded G2 version was released in 2018 with a faster processor.
Facts at a glance:
If you have a Hewlett-Packard HP Prime that is no longer working, you can first try replacing the 4xAAA batteries. If that doesn't solve the problem, then a repair might be possible, although you have to weigh up the costs against just buying a new one, as this model is still currently available.