RKI Instruments is a Mfg./Supplier of portable and fixed systems gas detection instruments. As the North American subsidiary of Riken Keiki Co, world leader in gas detection and sensor technology for over 70 years, RKI markets Riken products and actively develops its own product lines around Riken sensors. Product lines include watch style single gas monitors, smallest single gas combustible, smallest 4-gas monitor, unique 5 sensor sample draw with 100% volume methane range, and versatile 6 gas portable with over 500 configurations and PID capability. Sensor technologies include catalytic combustion, thermal conductivity, electrochemical, infra-red, paper tape, pyrolization, and metal oxide.