The Unisonic 931-B is an arithmetic calculator with algebraic logic. It has 6 functions, and a VFD (vacuum fluorescent) display. The power source is 3xAAA.
Facts at a glance:
If you have a Unisonic 931-B 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 models as possible replacements: