Which brand of small particle negative ion machine has the highest concentration?

Senpeptidyl. According to China's inquiry. Com, the highest concentration of small particle size negative ion machine is Senpeptide type, A8 portable, without any sound, with good design, materials and technology, and good results. Senpeptide-based negative ion air purifier is an ecological negative oxygen ion air purifier, which is sterilized by household negative ion generator to eliminate indoor PM2.5.