... High metrological performance, low pressure loss and steady operation.6. Moving parts are self-lubricating materials with lower ... 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 ...