Helec GT 539 (tip-in)
The Helec GT 539 is an arithmetic calculator with algebraic logic. It has 5 functions, 22 keys, and an LED (light-emitting diode) display, typical of calculators of this era.
Facts at a glance:
If you have a Helec GT 539 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements: