"航空粉尘计数器" can be translated as "Aviation Dust Counter" or "Aircraft Dust Particle Counter" (depending on the specific context and emphasis; the latter is more descriptive of its use in aircraft-related environments).
"Aviation Dust Counter" is concise and directly associates the device with aviation.
"Aircraft Dust Particle Counter" provides more detail, specifying that it counts dust particles specifically in aircraft-related contexts.
Both are acceptable, with the choice depending on the intended audience and level of specificity required.