Brooks Mass Flow Controller 5850E Series S/N: 0100100156928001. The Brooks Mass Flow Controller you have is part of the 5850E Series, and its serial number is 0100100156928001. This series is known for its precision and reliability in controlling the flow of gases in various industrial processes. All Major Credit Cards. WE ALSO ALLOW LOCAL PICK-UP AT OUR FACILITY. DO NOT FORGET ABOUT ANY OTHER CHARGES WHICH ARE CHARGED BY THE CARRIER. WE WILL NOT LEAVE FEEDBACK FOR BUYERS UNTIL WE RECEIVE FEEDBACK. Please call for expedited orders. LOCAL PICKUPS ARE FREE AND ALWAYS WELCOME! Some exceptions may apply. We also accept personal or business checks. On large items we may request certified funds only. Let us know what’s going on and we’ll provide you a return label. When we receive the product we will confirm item is defective.