Battery
Tools
These are some common tools used to work on this device. You might not need every tool for every procedure.
The FX-991EX utilises a solar panel alongside a battery and has a 192 x 63 LCD display. There are 60 buttons on the front and 522 total functions. It's allowed in a wide variety of exam, including GCSE, A-Levels, National and Higher, Junior and Leaving.