The Summit SI-90 is a scientific calculator with 10 digits precision and algebraic logic. It has 20 functions, 36 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is Sealed battery pack.
Facts at a glance:
|Power Source||Sealed battery pack|
If you have a Summit SI-90 that is no longer working, you can consider replacing the calculator with a modern equivalent.
We suggest the following current model as a replacement: