# Faber-Castell TRX

The Faber-Castell TRX is an arithmetic calculator with 8 digits precision and algebraic logic. It has 5 functions, 20 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 2xAAA.
**Note:** Combination slide rule and calculator.

## Facts at a glance:

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

Type | Arithmetic |

Functions | 5 |

Keys | 20 |

Precision | 8 |

Logic | Algebraic |

Display type | LED |

Length | 58mm |

Width | 172mm |

Thickness | 15mm |

Power Source | 2xAAA |

Year introduced | 1974 |

Year discontinued | 1974 |

## Replacements:

If you have a Faber-Castell TRX that is no longer working, you can first try replacing the 2xAAA 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: