What are size screws needed for PMS5003 and pcb DIY BASIC?
For the PMS5003 I used double sided sticky tape to hold it to the PCB.
Assuming for the PMS sensor it is all the same you can look here:
For the PCB probably also the size stated in the components table, but not sure if there might be a difference between Pro and Basic.
So it is:
PMS Sensor: M2*4.5