Nope i have not come across this one. I cant find it on qoo10 too. Got the URL?
This Blue world KF94, is it also as breathable (ie breathing resistance) as the Good Manner one when you compare it side by side? (use fingers to press down the nose wire so that both are not leaking...in real life i'll be using 3M micropore).
If it is that good, and most importantly even cheaper, can share it here so that others can get it as well.
ps. i think filtration wise the Good Manner and many KF94s are already way up there......i cannot really find any measurable differences between any of the KF94 models.
I use ambient air pollution as a test aerosol, between the F727 BFE 99.9% and the various KF94, i still could measure a wee bit of filtration difference (really very little, literally non existent).
If on a really hazy day then would i be able to tease out more, the difference is really that small.
eg more professional measurements on pro grade equipment as fitted on the fella's face.