... gas 3.Different type for choose 4.CE,ISO9001,14001 General IntroductionPrepaid IC Card Diaphragm Gas Meter ... Equipment The Workshop ModelFQ-SL---steel shell, LCD display, left entrance, G1.6/2.5/4.0FQ-SR---steel ... shell, LCD display, right entrance, G1.6/2.5/4.0FQ-SB---steel shell, LCD display, left ... /right entrance, gas leaking alarming port, G1.6/2.5/4.0 Prepaid IC Card Diaphragm Gas Meter ...