Designation : Mass Flow Controller, 2900 Series, 100 SCCM, CHF3. => Photos were taken in as much detail as possible. R emoved from working system. I do not accept return. => If you have any questions, Please leave us a message. In case of any dispute, me(our company) reserves the right of final explanation. Return can be accepted within 14 days. ROR (Right of Return). After item arrived, and it has to be in the original condition as it was sent out. If you have any problem getting product, Please let me know before open case. Use your negligence does not apply. (Breakage, Over power etc). Items misused or damaged by customer’s misused (intentional or unintentional).