Hewlett-Packard HP 31E (Spice/Spike GINGER)
The Hewlett-Packard HP 31E is a scientific calculator with 10 digits precision and algebraic logic. It has 30 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 2xAA.
Facts at a glance:
Note that diagnostic tests generally delete any data on the calculator. Be sure to back up any important information held in the calculator before running these tests.
Press STO then ENTER - if self-test is okay it will turn on all display elements
If you have a Hewlett-Packard HP 31E that is no longer working, you can first try replacing the 2xAA 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: