How can I set micropipette volume with decimal separators, for example 109.5 in p200?
It doesn't make sense to set volumes of decimals of microliters with a P200, since usually the accuracy of these pipettes is in the order of a few microliters. So even if you set your pipette at 190 uL, you may still dispense a volume ranging from 187 to 193 uL. For a P1000, due to higher volumes the inaccuracy is of course higher, usually +/- 10 uL or more. Some brands are more accurate than others, like Eppendorf or Finnpipette. I suggest you check the specs of your pipettes and see how much accuracy you can achieve.