MBO DERBY II
The MBO DERBY II is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 19 keys, and a VFD (vacuum fluorescent) display. The power source is AA batteries.
Facts at a glance:
If you have a MBO DERBY II that is no longer working, you can first try replacing the AA battery. 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: