Radio Shack EC-4020
The Radio Shack EC-4020 is a programmable calculator with 12 digits precision and algebraic logic. It has 44 keys, and an LCD (liquid crystal) display. The power source is 2x3V cell. Note: Casio fx-4000P
Facts at a glance:
|Power Source||2x3V cell|
If you have a Radio Shack EC-4020 that is no longer working, you can first try replacing the 2x3V cell batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent.
We suggest the following current model as a replacement: