... ≥10 Years 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 Remote Gas Meter ...