Hi, Sergio

I didn't know the 1.0l 4 cyl ... just 1.2l 3cyl and 1.4l 4 cyl ... apologies, then.

If your engine is in a good condition ... we can consider all injectors give the same amount ... the error will be very very small.

Considering the injection duration, you can measure for the 4 injectors ... just "for the sport".

Using a CCP is a good Idea for measuring ... as you can use the same "timer" to measure the 4 injectors ( they do not bleed at the same moment ...) and interrupts will tell you only when the result is ready to read ( Capture mode )

Alain