Fully functional, original tags, very clean. Installation and operation manual included (46 pages PDF). Electronic flowmeter by Brooks Instrument, model MassRate 5700. Flow range 0-5 SLPM. N2=3.82 SLPM CH4. Up to 150 psig. Temperature limit 5 to 65°C. Power 11.5 to 15.5 Vdc, 50 mA. Model 5700AJ2A1AA. Pre-owned and tested industrial surplus from a closing plant in Quebec, Canada. Minor surface scratches only.