... 30 * 2mm 4.40year's history experience IC card prepaid gas meter Main technical parameters and characteristics: 1. JRB1.6, JRB2.5 ... -type gas meter, the largest flow is 2.5m3 / h, the maximum ... and electronic display ensure the accuracy of gas meter. 8. LCD can display the gas volume, accumulated gas volume, valve status, battery status and ...