About Sphere Research Corporation
Sphere's site contains both an Electronic Test Equipment and Slide Rule on-line warehouse with engineering resources. PLUS an original e-library, including quotes, business practices and ethics, short stories and columns. We provide extensive test equipment support information, and one of the world's largest slide rule data archives. Looking for spare parts to support Tektronix, Hewlett Packard or Fluke test equipment? We have fully illustrated parts catalogs to help you. We also have an extensive stock of CRTs (Cathode Ray Tubes), Nixies, and Industrial tubes of all kinds.