page F-9 EXHIBIT 21 SUBSIDIARIES OF THE COMPANY Company Jurisdiction Ownership - -------------------------------------------------------------------------------- Aerometrics, Inc. Minnesota 100% Alnor Instrument Company Minnesota 100% Environmental Systems Corporation Tennessee 100% (as of May 26, 1999) Handar California 100% TSI Foreign Sales Corporation Barbados, West Indies 100% TSI France Inc. Minnesota 100% TSI GmbH Germany 100% Transducer Research, Inc. Minnesota 100% TSI Instruments, Inc. Michigan 100%