... on 2, portable one 3, CE and ROHS approved 20g portable ozone machine for hotel with CEFeature:1 Outer case is made ... air-source and oxygen source one machine, the customer can use on demand Useful: 1, the laboratory: materials, oxidation, fading, ... water, production workshop, sterile room, equipment, tools and so on.5, the pharmaceutical industry: production, such as water, central air conditioning ...