Measurement technology manufacturer TSI Inc., Shoreview, Minn., (tsi.com) acquired instrument-production lines owned by Airflow Developments Ltd., of High Wycombe, England. TSI acquired the Test Instruments portion of ADL's business, including manufacturing, assembly, and sales and service operations. Airflow serves the heating, ventilation, and building-services instruments markets. Its products compliment TSl's indoor air quality and ventilation-test instruments product lines.