Unitrex 90SC
The Unitrex 90SC is a scientific calculator with 8 digits precision and RPN (reverse polish notation) logic. It has 23 functions, 22 keys, and an LED (light-emitting diode) display typical of calculators of this era. The power source is PP3 9V.
One of the few RPN calculators made by manufacturers other than Hewlett-Packard.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Scientific |
| Functions | 23 |
| Keys | 22 |
| Precision | 8 |
| Logic | RPN |
| Display type | LED |
| Length | 140mm |
| Width | 70mm |
| Power Source | PP3 9V |
| Year introduced | 1975 |
Replacements:
If you have a Unitrex 90SC that is no longer working, you can first try replacing the PP3 9V 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: