The Citizen SR-135N is a scientific calculator with 12 digits precision and formula input logic. It has 128 functions, 42 keys, and an LCD (liquid crystal) display. The power source is 1xLR44. The calculator was manufactured in Japan.
Facts at a glance:
If you have a Citizen SR-135N that is no longer working, you can first try replacing the 1xLR44 battery. 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: