Hewlett-Packard HP 55 (Classic MERLIN)
The Hewlett-Packard HP 55 is a programmable calculator with 12 digits precision and algebraic logic. It has 75 functions, 35 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 3xAA.
Facts at a glance:
If you have a Hewlett-Packard HP 55 that is no longer working, you can first try replacing the 3xAA 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: