Protronic 535
The Protronic 535 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 10 functions, 22 keys, and a VFD (vacuum fluorescent) display. The power source is 2xAA batteries. Note: combined calculator and cigarette lighter
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Arithmetic |
| Functions | 10 |
| Keys | 22 |
| Precision | 8 |
| Logic | Algebraic |
| Display type | VFD |
| Power Source | 2xAA batteries |
| Year introduced | 1975 |
Replacements:
If you have a Protronic 535 that is no longer working, you can first try replacing the 2xAA batteries. 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: