MBO Sigma 1
The MBO Sigma 1 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 PP3 9V.
Facts at a glance:
|Power Source||PP3 9V|
If you have a MBO Sigma 1 that is no longer working, you can first try replacing the PP3 9V 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: