Used condition; may have wear and age related marks. See pics for condition / what’s included / testing conducted. Celerity 750-001-A2343 Rev E MFC-1 Mass Flow Controller 500 PSI Celerity/Unit mass flow controller marked MFC-1 with assembly 750-001-A2343 Rev E. Housing specifies 500 PSI max / 3500 kPa and Vendor ID 179822. Condition: Used industrial surplus item with possible age, storage and cosmetic wear. Untested unless explicitly stated; see photographs for exact condition and included parts. Please match exact part/model/configuration and photographed connectors to your application before purchase. Includes x1 mass flow controller as photographed.