Established in 1974, Windsor, Connecticut based Envirotest Corp. is the leader in vehicle emissions testing equipment and ser ... vices in North America and provides Remote Sensing Device equipment and services throughout the world. The company operates six large, high-volume vehicle emissions testing programs in the U.S. and Canada under its Envirotest brand. Envirotest Corp. is an operating subsidiary of Opus Inspection (opusinspection.com). read more