Keystone SC 656

The Keystone SC 656 is a scientific calculator with algebraic logic. It has 18 functions, 30 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:

Feature Value
Type: Scientific
Functions: 18
Keys: 30
Logic: Algebraic
Display type: LED
Length: 152mm
Width: 81mm
Power Source: Sealed battery pack
Year introduced: 1975

See other calculators by Keystone