Products which are manufactured by Sigma-Tek are available from your avionics or instrument supplier.

Aerolab Aviation Services, Inc.
Aeroneuf Instruments Ltd.
Aircraft Instruments cc - Lanseria South Africa
Aircraft Spruce
Airwich Avionics
Airwork Avionics
Atlantic Aero
Australian Avionics Pty Ltd.

Avincorp Pty Ltd.
Avionics of Modern Aero, Inc.
Avionics Sales Corporation
Banyan Air
Canadian Avionics & Instruments, Ltd.
Century Avionics CC
Chief Aircraft
Commander Instruments & Avionics
Duncan Aviation
Eastern Avionics
Eletronave LTDA
Fieldtech Avionics & Inst., Inc.
Flightcraft, Inc.
Frederick Aviation, Inc.
Global Aviation Support
Gulf Coast Avionics
Hagerstown Aircraft Services, Inc.
Hillview Avionics, Inc.
Instrument Tech Corp.
I P C O - France
JA Air Center
Kelley Instruments
Lowe Aviation Company
Merrill Field Instruments
Mid Continent Instruments
Mid Continent Instruments - West
Miller Aviation
National Airways Corporation - Lanseria South Africa
Otto Instruments
Pacific Coast Avionics
Pacific Southwest Instruments
Penn Avionics
Porter Strait Instrument Company
San Luis Avionics
Sebastian Communication, Inc.
Sky West Instruments
Southeast Aerospace Inc.
Southern Aviation Technologies
Steiner Aviation
TGH Aviation
Toronto Avionics
Varga Enterprises, Inc.
VIP Avionics
Woodland Aviation
Woodlawn Instruments Ltd.