The Sharp EL-509A is a scientific calculator with 8 digits precision and algebraic logic. It has 28 functions, 35 keys, and an LCD (liquid crystal) display. The power source is 2xLR44.
Facts at a glance:
If you have a Sharp EL-509A that is no longer working, you can first try replacing the 2xLR44 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: