Countis Laboratories manufactures materials which are used in the microwave industry. The product lines consist of ferrite material (garnet, spinel, and hexagonal), dielectric material, and magnetic material. These materials are precision machined for use in microwave components for applications in space, defense, commercial telecommunications, cellular, automotive, and medical fields.

Thomas J. Countis established Countis Industries in 1964 located in San Luis Obispo, CA, where he developed a line of microwave spinel ferrite materials that were mainly sold to US firms working in the defense sector. Mr. Countis graduated from the University of Colorado in 1949 with a degree in Engineering Physics and worked for 15 years in magnetic material development before starting his own company. Mr. Countis gained knowledge of microwave ferrites from his experience working at Collins Radio Company from 1953 to 1957 and Hughes Aircraft Company from 1958 to 1963. He was instrumental in setting up and producing the first ferrite materials used in microwave devices.