Faber-Castell TR4
The Faber-Castell TR4 is a scientific calculator with 8 digits precision and algebraic logic. It has 26 functions, 25 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 | Scientific |
| Functions | 26 |
| Keys | 25 |
| Precision | 8 |
| Logic | Algebraic |
| Display type | LED |
| Length | 58mm |
| Width | 172mm |
| Thickness | 15mm |
| Year introduced | 1975 |
Replacements:
If you have a Faber-Castell TR4 that is no longer working, you can consider replacing the calculator with a modern equivalent.
We suggest the following current model as a replacement: