... IC card gas meter 1, Large flow, industrial gas meter; 2, Application: natural gas, liquid petroleum gas and coal. commercial IC card gas meterFeature:1, ... meter reading;4, data storage, replace the batteries without losing data;5, machinery counter display the accumulate gas, liquid-crystal display the surplus gas ... :>=15 yearsStandard: GB/T6968-1977gas meter>. commercial IC card gas meter