Tektronix measures up as a leader in the testing industry. The company, widely known as Tek, is one of the world's largest makers of test and measurement instruments, such as digital multimeters, logic analyzers, and signal generators. In particular, Tektronix is the world's largest maker of oscilloscopes (instruments used to check electrical and electronic equipment); it offers scopes in all shapes and sizes, from handheld units to large laboratory models. Tek, which is a subsidiary of  Danaher, does business worldwide, serving clients in the communications, aerospace/defense, consumer electronics, education, and semiconductor industries, among others.