The Technico 55SR is a scientific calculator with algebraic logic. It has 23 functions, 25 keys, and a VFD (vacuum fluorescent) display. The power source is 3xAA.
Facts at a glance:
If you have a Technico 55SR 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: