Texas Instruments SR-51A

Texas Instruments SR-51A
Image: Joe Haupt, CC BY-SA 2.0
The Texas Instruments SR-51A is a scientific calculator with 10 digits precision and algebraic logic. It has 42 functions, 40 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 3xAA sealed. The calculator was manufactured in Holland; USA.

Facts at a glance:

Feature Value
Type: Scientific
Functions: 42
Keys: 40
Precision: 10
Logic: Algebraic
Display type: LED
Printer: Yes
Length: 147mm
Width: 81mm
Thickness: 32mm
Power Source: 3xAA sealed
Country: Holland; USA
Year introduced: 1975
YearDiscontinued: 1976

See other calculators by Texas Instruments