Neckermann DUO-PHON 12
The Neckermann DUO-PHON 12 is an arithmetic calculator with algebraic logic. It has 6 functions, 24 keys, and an LED (light-emitting diode) display, typical of calculators of this era.
Facts at a glance:
If you have a Neckermann DUO-PHON 12 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements: