Casio fx-7400GIII
 
The Casio fx-7400GIII is a graphing calculator with 10 digits precision and formula input logic. It has 406 functions, 50 keys, and an LCD (liquid crystal) display. The power source is 2xAAA + CR2032. The calculator was manufactured in China. Note: Updated version of fx-7400GII
Facts at a glance:
| Feature | Value | 
|---|---|
| Type | Graphing | 
| Functions | 406 | 
| Keys | 50 | 
| Precision | 10 | 
| Logic | Formula | 
| Display type | LCD | 
| Display size | 96 | 
| Length | 164mm | 
| Width | 82mm | 
| Thickness | 20mm | 
| Weight | 160g | 
| Power Consumption | 0.050000W | 
| Power Source | 2xAAA + CR2032 | 
| Country | China | 
| Original price | $70 | 
| Year introduced | 2020 | 
| Current price | amazon.com | 
User Manual
You can download the Casio fx-7400GIII manual from this external link.
Replacements:
If you have a Casio fx-7400GIII that is no longer working, you can first try replacing the 2xAAA + CR2032. If that doesn't solve the problem, then a repair might be possible, although you have to weigh up the costs against just buying a new one, as this model is still currently available.