ComSonics makes community antenna television (CATV) test equipment, including signal-level meters, radio frequency leakage detectors, fault locators, and underground cable locators. The company also provides CATV equipment repair and warranty services. ComSonics operates a Web portal for electronics products at TekGear.com. A subsidiary, CEMSI, provides contract manufacturing services for printed circuit boards. ComSonics was founded in 1972 by Warren Braun and a small group of engineers, including CEO Dennis Zimmerman. The company is owned by its employees.