Sooner Scale, Inc. Corporate Headquarters Oklahoma City, Oklahoma SSI was originally established in 1969 as a sales and service company in the weighing industry. Through it's innovation and foresight, SSI initiated the manufacturing of scales in 1976 and quickly became one of the pioneers of above ground pitless motor truck scales and livestock scales. Since our ground roots beginning, we have become one of the major producers in the United States of pitless scales. SSI manufactures a complete line of Side Rail and Flat Top model truck scales and Livestock scales. All models are NTEP approved and can be made portable. We also design and build custom units to meet specific application needs. SSI products are provided in the United States and Internationally through our Oklahoma City office. Members of the International Society of Weighing and Measurement and National Conference on Weights and Measures.