Tylan 2900 SERIES, FC-2910-4S, Mass Flow Controller, 50 SLPM, O2. Price is for 1 item. , unless it is mentioned in the description and shown in the picture. We do not have the capability to test these equipment, these are untested and we sell as is, see pictures for more details. Don’t have the capability to verify this equipment. All buyers are welcome and inspect the equipment before purchasing them. 562 South Milpitas Blvd. Saturday and Sunday by appointment. We are also interested in your unwanted or excess inventory. We supply many other semiconductor components/equipment such as RF generators, chillers, turbo pumps, cryo pumps, MFC’s, vacuum pumps and controllers, step motors and drivers, etc.