Air Monitor Corporation is based in Santa Rosa, CA and was founded in 1970. They are focused on providing a complete product mix of high-quality airflow measurement devices for the HVAC market. Air Monitor is an ONICON brand that has made significant strides in product development in recent years, as well as customer support & warranty. All devices include a NIST traceable calibration certificate and come with a 3-year warranty (first year ‘no-fault’).