... one 3, CE and ROHS approved 20g portable ozone machine for hotel with CEFeature:1 Outer case is made of the corrosion ... industry: such as the production of water, production workshop, sterile room, equipment, tools and so on.5, the pharmaceutical industry: ... such as water, central air conditioning systems, shop, locker room, sterile room.6, the medical industry: such as hospital wards, operating ...