Hewlett-Packard HP 40G
The Hewlett-Packard HP 40G is a graphing calculator with algebraic logic. It has 51 keys, and an LCD (liquid crystal) display. The power source is 3xAAA. Note: HP-39G less the IR port.
Facts at a glance:
If you have a Hewlett-Packard HP 40G that is no longer working, you can first try replacing the 3xAAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement: