# Faber-Castell TR1 (TR1 Calculator Slide Rule)

The Faber-Castell TR1 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 9 functions, 21 keys, and an LED (light-emitting diode) display typical of calculators of this era.
**Note:** Combination slide rule and calculator.

## Facts at a glance:

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

Type | Arithmetic |

Functions | 9 |

Keys | 21 |

Precision | 8 |

Logic | Algebraic |

Display type | LED |

Length | 58mm |

Width | 172mm |

Thickness | 15mm |

Weight | 140g |

Year introduced | 1973 |

Year discontinued | 1973 |

## Replacements:

If you have a Faber-Castell TR1 that is no longer working, you can consider replacing the calculator with a modern equivalent.

We suggest the following current models as possible replacements: