Met One Instruments, Inc. (MOI) is an expanding, aggressive company providing solutions to environmental air monitoring requirements. MOI produces particulate monitors, meteorological instruments and systems, handheld particle counters, as well as data loggers and environmental software. MOI is one of the oldest instrument manufacturers in the United States and MOI continues to provide the most advanced instrumentation worldwide.

Projects have included entire meteorological monitoring networks for countries from Asia to the Middle East, as well as the major part of PM monitoring within the USA and International sites. After sales service, free factory training for complete end-user satisfaction has always been foremost. Private industry, research institutions, universities, military and home defense organizations, as well as all levels of government environmental agencies are amongst its satisfied customers.