# MBO Sigma 20

The MBO Sigma 20 is a scientific calculator with 12 digits precision and algebraic logic. It has 26 functions, 25 keys, and a VFD (vacuum fluorescent) display. The power source is PP3 9V.

## Facts at a glance:

Feature | Value |
---|---|

Type | Scientific |

Functions | 26 |

Keys | 25 |

Precision | 12 |

Logic | Algebraic |

Display type | VFD |

Power Source | PP3 9V |

Year introduced | 1975 |

## Replacements:

If you have a MBO Sigma 20 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 model as a replacement: