... products are following :1,SBL target flow meter,the number of patent is ZL0020624.0 2, composite impeller flow ... certification through the national institute of metrology and the certification number is RGfs2007-0913&RGfs2007-0914.because Rixin flow meter ... air,coke oven gas,water,sewage water measuringSulige gas power generation Co.Ltd of Inner Mongoliawater,wind,natural gas measuringDongfang ...