Keithley Instruments, Inc. (Keithley) designs, develops, manufactures and markets electronic instruments and systems to meet the specialized needs of electronics manufacturers for high-performance production testing, process monitoring, product development and research. The Company has approximately 500 products used to source, measure, connect, control or communicate direct current (DC), radio frequency (RF) or optical signals. Its product offerings include integrated systems solutions, along with instruments and personal computer (PC) plug-in boards that can be used as system components or standalone solutions. Keithley’s customers are scientists and engineers in the electronics industry involved with advanced materials research, semiconductor device development and fabrication, and the production of end products, such as portable wireless devices.