... , portable one 3, CE and ROHS approved 20g portable ozone machine for hotel with CEFeature:1 Outer case is made of ... sterilization, long-life design4 air-source and oxygen source one machine, the customer can use on demand Useful: 1, the laboratory ... 40g, 50g,100g ozone machine, the machines are customized! Welcome your inquiries! 20g ozone machine for hotel use in water purifier with CE