Faber-Castell TR1

Date of introduction:  1973 Display technology:  LED
New price:   Display size:  8 
Size:  2.3" x 6.8" x 0.6"    
Weight:  3.5 ounces Serial No:  
Batteries:  4*NiCd Date of manufacture:  
AC-Adapter:   Origin of manufacture:  Germany
Precision:  8 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Peter Muckermann († April 21, 2021)

A.W. Faber-Castell, a German manufacturer of slide rules, introduced in the year 1973 the „TR1 Calculator Slide Rule“. One side of the housing featured an electronic calculator and the other side a traditional slide rule. Although the idea was innovative that time the success on the calculator market was very limited.

The backside of the TR1 gives a traditional slide rule. TR1_1.jpg (68325 Byte)
A magnification of the slide rule. TR1_2.jpg (70858 Byte)
The rechargeable battery pack used with the TR1, TR2 and TR3 calculators. It is assembled from four button shaped NiCd cells. TR_BAT.jpg (28740 Byte)

Compared to the huge line of calculators by German competitor ARISTO starting with the M27 only 4 Faber-Castell calculators are known:


TR1 Memory, x2 and 1/x


TR2 Full Memory, x2, sqr(x), % and 1/x


TR3 Full Scientific including logarithmic and trigonometric functions


TRX Missing the slide rule on the back

horizontal rule

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© Joerg Woerner, May 3, 2002. No reprints without written permission.