Keystone SC 650

The Keystone SC 650 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 7 functions, 20 keys, and a gas discharge display. The power source is 2xAA.

Facts at a glance:

Feature Value
Type: Arithmetic
Functions: 7
Keys: 20
Precision: 8
Logic: Algebraic
Display type: Discharge
Length: 140mm
Width: 81mm
Power Source: 2xAA
Year introduced: 1975

See other calculators by Keystone