Analytical Industries Inc., doing business in the industrial marketplace under the trade name Advanced Instruments Inc., has ... earned a reputation around the world for innovative solutions to gas analysis that encompass the design and manufacture of advanced oxygen sensors and oxygen analyzer platforms, a passion for reliable quality and superior customer support. As a result, AII has become a leading worldwide supplier of oxygen sensors, PPM and % oxygen sensors, PPB, PPM and % oxygen analyzers, H2S, CO, Heliox, and Trimix analyzers to the industrial process control, natural gas, medical and sports diving industries. read more