... 3, CE and ROHS approved 20g portable ozone machine for hotel with CEFeature:1 Outer case is made ... of mobile disinfection3 ozone quartz glass tube cavity for the removal of ozone at high concentrations, ... and oxygen source one machine, the customer can use on demand Useful: 1, the laboratory: materials, oxidation, ... the 40g, 50g,100g ozone machine, the machines are customized! Welcome your inquiries!