... , portable one 3, CE and ROHS approved 20g portable ozone machine for hotel with CEFeature:1 Outer case is made of the ... sterilization, long-life design4 air-source and oxygen source one machine, the customer can use on demand Useful: 1, the ... laboratory: materials, oxidation, fading, and the effect of small scale sewage treatment experiments.2, the beverage processing industry: such ...