# APF RS-1 (Kel-Co)

The APF RS-1 is an arithmetic calculator with algebraic logic. It has 16 functions, 29 keys, and an LED (light-emitting diode) display typical of calculators of this era. The power source is PP3 9V.
**Note:** APF RS-1; Cannelle RS1

## Facts at a glance:

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

Type | Arithmetic |

Functions | 16 |

Keys | 29 |

Logic | Algebraic |

Display type | LED |

Length | 140mm |

Width | 70mm |

Power Source | PP3 9V |

Year introduced | 1979 |

## Replacements:

If you have an APF RS-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: