RKI Instruments, Inc. is an innovative gas detection company located in Union City, California. RKI is partnered with Riken Keiki Company, Ltd., the world leader in gas detection and sensor technologies. RKI is also known for our unique product development. We have developed our own line of gas detection instruments to complement the Riken product line. Our combination of quality products and knowledgeable people gives you the ability to confidently face almost any gas monitoring application.