Fully functional, original tags, very clean. Mass flow sensor for hydrogen by Brooks Instrument, model 5860 E Series. Includes two swagelok 3/8" #316 fittings. Flow: 0-150 SLPM H2 @ 0°C, 1013.25 mBar. Gas: Hydrogen. I/O signal: 0-5 Vdc. Power: +15 Vdc. P1/P2: P1= 5 psig. 1500 psig max. Base is model 5861E. Pre-owned and tested industrial surplus from a closing plant in Quebec, Canada. Minor surface scratches only.