Used condition; may have wear and age related marks. See pics for condition / what’s included / testing conducted. Aera FC-981 O2 20 SLM Mass Flow Controller Advanced Energy P2700300 Aera/Advanced Energy FC-981 mass flow controller calibrated for O2 at 20 SLM. The housing is marked FC-981, P2700300 and Advanced Energy Industries. 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.