Mid-State Instruments (MSI) is a manufacturer's representative and distributor serving the United States. Mid-State Instruments has offices in Southern, Central, and Northern California for sales, service, and technical assistance. MSI represents ten of the top manufacturers of portable infrared cameras, fixed infrared cameras, fixed toxic, combustible and flammable gas detection, portable gas detection, non-contact infrared measurement, CEMS systems, continuous and laser gas analyzers, and data loggers.