Our folw meter's model : 80L/h,160L/h,300L/h,800L/h,2.5M3/h .... 1,we have many range of flow meter for our various ozone generator. Such as : 80L/h,160L/h,300H/h,800L/h,2.5M3/h ....2,we can adjust the flow of oxygen to adjust the capacity of ozone, then it is adjustable.1)photos of company: 2)clients visit our factory:3,certification of ozone machine flow meter