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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:

FeatureValue
TypeScientific
Functions26
Keys25
Precision8
LogicAlgebraic
Display typeLED
Length58mm
Width172mm
Thickness15mm
Year introduced1975

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:

See other calculators by Faber-Castell