# APF MARK 5501

The APF MARK 5501 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 30 keys, and an LCD (liquid crystal) display. The power source is 2x1.5V mercury cell.
**Note:** time

## Facts at a glance:

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

Type | Arithmetic |

Functions | 6 |

Keys | 30 |

Precision | 8 |

Logic | Algebraic |

Display type | LCD |

Power Source | 2x1.5V mercury cell |

Year introduced | 1980 |

## Replacements:

If you have an APF MARK 5501 that is no longer working, you can first try replacing the 2x1.5V mercury cell 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: