# Colex 811-A

The Colex 811-A is an arithmetic calculator with algebraic logic. It has a VFD (vacuum fluorescent) display. The power source is 4xAA.

## Facts at a glance:

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

Type | Arithmetic |

Logic | Algebraic |

Display type | VFD |

Length | 152mm |

Width | 95mm |

Power Source | 4xAA |

Year introduced | 1974 |

## Replacements:

If you have a Colex 811-A that is no longer working, you can first try replacing the 4xAA 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: