... .Ltd HK-J2.5H membrane is a volumetric gas meter diaphragm gas meter.It has a beautiful shape, small size, light weight ... ) Compact structure, 1.2dm3 cyclic volume/flow2) Inside/outside of meter case is electro dusted, which insures nice appearance, moisture-proof ... still offer the models likeIC card gas meter, Intelligent meter, Remote control and Prepaid gas meter. G1.6, G2.5 G 4.0 ...