Radio Shack EC-4004
The Radio Shack EC-4004 is a programmable calculator with 10 digits precision and algebraic logic. It has 39 keys, and an LCD (liquid crystal) display. Note: Casio fx-3500P
Facts at a glance:
If you have a Radio Shack EC-4004 that is no longer working, you can consider replacing the calculator with a modern equivalent.
We suggest the following current model as a replacement: