The MKS Instruments 2179A00422CR1BV Mass-Flo Controller is a high-quality gas flow controller designed for precise control of helium gas flow. Made in the United States by MKS Instruments, this controller features a 1/4 inch port diameter and a maximum flow rate of 200 SCCM (stem flow). Ideal for use in a variety of industrial and research applications, this controller ensures accurate and reliable regulation of gas flow with its precision engineering and durable construction. Each unit is sold individually, making it a versatile and essential component for controlling the flow of Ar gas in your system.

Mounted on an aluminum plate with a pneumatically actuated, spring-less, high-purity control valve (Swagelok 6LVV-DP6901C).