APF MARK 88
The APF MARK 88 is a scientific calculator with algebraic logic. It has 19 keys, and a VFD (vacuum fluorescent) display. The power source is 3xAAA.
Facts at a glance:
If you have an APF MARK 88 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: