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

See other calculators by Faber-Castell