A change of power... battery change info needed

[Matt Agajanian]

Hello all.

I am not very adept at handyman work so, I'd appreciate your help.

So that I do not destroy the battery door screws, I would like to know the size of the jewelry screwdrivers I should use when I replace the batteries of a TI-36x Pro, Casio FX-115ES Plus and the Sharp EL-W516X. That way, I could buy a toolkit with the right tools in it.

Much appreciated.

Thanks.