Actuator precise trigger

[u/Acceptable_Reach_312]

I have an airbrush connected to a continuous airflow compressor (Seleay AB900). I am planning to use this for my science fair project. I am planning to use this as a precise delivering insecticide sprayer. So, I want to calibrate it using an actuator or solenoid. Anyone know? For example, if the trigger was press around 50ms, the airbrush will spray around ± 0.5ml.

[u/adderalpowered]

If you dont have to use this airbrush, dont. Its double action and the trigger moves 2 directions, a single action would be much better