Helec GT 537 (tip-in)

The Helec GT 537 is an arithmetic calculator with algebraic logic. It has 5 functions, 19 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 5xAA.

Facts at a glance:

Feature Value
Type: Arithmetic
Functions: 5
Keys: 19
Logic: Algebraic
Display type: LED
Power Source: 5xAA
Year introduced: 1974

See other calculators by Helec