The Serd 21PD-N is an arithmetic calculator with 9 digits precision and algebraic logic. It has 7 functions, 27 keys, and a VFD (vacuum fluorescent) display. Note: Elektronika MK-40
Facts at a glance:
If you have a Serd 21PD-N that is no longer working, you can consider replacing the calculator with a modern equivalent.
We suggest the following current models as possible replacements: