# Keystone 395 (exponent 1)

The Keystone 395 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 8 functions, 22 keys, and a gas discharge display. The power source is 4xAA sealed.

## Facts at a glance:

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

Type | Arithmetic |

Functions | 8 |

Keys | 22 |

Precision | 8 |

Logic | Algebraic |

Display type | Discharge |

Length | 133mm |

Width | 81mm |

Power Source | 4xAA sealed |

Year introduced | 1974 |

Year discontinued | 1974 |

## Replacements:

If you have a Keystone 395 that is no longer working, you can first try replacing the 4xAA sealed 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: