Hi everyone, I am looking for a dust particle counter to measure dust particles sizes when machining composites, the idea is to put the device inside the cnc machine and measure the particles size and concentration.

So far I learned that there are two devices used for measuring particles:

1) A counter that measures the particles concentration per unit of voulme
2) A counter that measure the particles sizes in microns.

can anyone recommend which one to use when machining composites?

Thanks in advance