SGX has been leading the way in the design, development and manufacture of a wide range of reliable gas sensors since developing the catalytic bead gas sensor (which became known as the Pellistor) in 1961. SGX gas sensors are built to the highest standards with all pellistor and infrared gas sensors achieving ATEX and IECEx certification, SGX gas sensors are also UL and CSA approved. Please note that all parts are shipped from the United States.