How can we know the air purifier in good purification capacity?

How can i know the air purifier in good purification capacity?
Lanjia particle counter have been upgrade one more fucntion purification rate,directly show the the value about the 1st and 2nd sampling.
easy understand and more science and technology meet your market demand.This is big advantage of ours machine compare other supplier.
Accept your more discuss OEM and cooperation.