Unisonic 840-B
The Unisonic 840-B is an arithmetic calculator with 8 digits precision and algebraic logic. It has 7 functions, 24 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAAA batteries.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Arithmetic |
| Functions | 7 |
| Keys | 24 |
| Precision | 8 |
| Logic | Algebraic |
| Display type | VFD |
| Power Consumption | 0.300000W |
| Power Source | 4xAAA batteries |
| Year introduced | 1975 |
Replacements:
If you have a Unisonic 840-B that is no longer working, you can first try replacing the 4xAAA 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: