The MBO fx-21 is a scientific calculator with 8 digits precision and algebraic logic. It has 30 functions, 35 keys, and a VFD (vacuum fluorescent) display. The power source is 2xAA. The calculator was manufactured in Japan. Note: Casio
Facts at a glance:
If you have a MBO fx-21 that is no longer working, you can first try replacing the 2xAA 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: