The Compex SR-55 is a scientific calculator with 9 digits precision and algebraic logic. It has 22 functions, 36 keys, and a VFD (vacuum fluorescent) display. The power source is 3xAA.
Facts at a glance:
If you have a Compex SR-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: