Brooks 5850i Mass Flow Controller, 500 SCCM, Oxygen, MOD: 5850IA1BF3R2BGA

PLEASE REVIEW: We would ask that potential buyers please examine the photographs carefully, and understand what you are buying. All questions should be submitted prior to your purchase. Your purchase is protected by a 30 day warranty. We cannot negotiate price or terms after the sale has closed. Payment is expected within 24 hours please, and in return, we'll ship quickly. We appreciate your consideration! (bcd: yt-3-g)