The Tandy EC-309 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 28 keys, and an LCD (liquid crystal) display. The power source is 3V cell. Note: Radio Shack; data storage
Facts at a glance:
|Power Source||3V cell|
If you have a Tandy EC-309 that is no longer working, you can first try replacing the 3V cell battery. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent.
We suggest the following current models as possible replacements: