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Summit SI-90

The Summit SI-90 is a scientific calculator with 10 digits precision and algebraic logic. It has 20 functions, 36 keys and an LED (light-emitting diode) display, typical of calculators of this era. The power source is Sealed battery pack.

Facts at a glance:

Type Scientific
Functions 20
Keys 36
Precision 10
Logic Algebraic
Display type LED
Display size
Length 203 mm
Width 83 mm
Thickness 38 mm
Weight unknown g
Power Source Sealed battery pack
Original price unknown
Est. current value unknown
Year introduced 1974
Year discontinued 1974

See other calculators manufactured by Summit.