Theoretically Canon uses a JIS standard screwdriver. I had bought one for a LOT of money, and… it was worst, that the PH00 screwdrivers. So – nevermore.
But which PH00 screwdriver, if you need one?
I can advice you this: WIHA 00152
Just to understand, in the last years I have tried a lot of different ones:
UNIOR – good price, small handle,
BETA – expensive, too harde, broken in a short time
some noname – nevermore
Neo-Tools – very good geometry, thick handle, but no possibility to by only the bit. The gibe 25 years of warranty 🙂 , and I changed back 2 times the bit after breaking it, which is a good sport, but too much time.
The WIHA has a good price – 5 EUR – and there is available in Conrad shops.
But for some special cases you will need a torque controlled screwdriver. Her is my newest tool – and it is WONDERFUL. You can adjust the max toque, when you reach that, will vibrate and will generate a beep sound, but if you turn more the screw, will display the maximum reached value. Is very helpful.
You will need a PH00 1/4″ bit too – try this: