- Founded in 1980, ECS Inc. International has grown to become one of the most recognized and experienced manufacturers of frequency control management products in the world. From cylindrical tuning fork crystals to high stability oven controlled oscillators, ECS Inc. offers the most comprehensive line up of frequency control devices in the industry. Awarded ISO9001/2000 and QS-9000 certifications along with the pursuit of other global certifications has made ECS Inc. your global partner for dependable frequency management products. ECS is currently undergoing TS16949:2002 registration to replace our current QS-9000 certification. Our 65,000 square feet of manufacturing centers, we feature four (4) 10K clean room environments in accordance with International Standard 209. Automatic calibration and testing pods, environmental testing labs, isolated aging rooms and prototype labs complement these facilities. With it's continued growth, ECS Inc. has shown that it has the managerial, manufacturing and financial resources to support our customers in today's demanding marketplace across all industries.