The so-called external piston type is actually exactly the same as the principle of the syringe.
Is the color there to make a fashion statement? As many people in the lab who are not used to the systematic approach just force the pipette into the wrong holder, pipette or holder can be damaged.
The pipette does not fit at the holder? These pipettes require disposable tips that come in contact with the fluid.
You will now have a sample of liquid that remains in the tip, but is not part of the measurement.
Now that you have a tip on your pipette, you are ready to start pipetting! Which tip fits my pipette? An ergonomic design of this part of the pipette is crucial for stress-free working hours.
You can then repeat the aspiration procedure and continue.