I know there's not a definite answer for this, but, I recently bought a second hand CAS. It is the black and white screen ones that use AAA batteries.
It's 100% working right now, I updated the OS.
I'm just scared these old CAS will completely die during/leading up to my methods exam. What I mean by die is not battery going flat because i can put new ones in, I mean when they actually don't work at all.
Anyone have any experiences?