EIP Microwave pioneered many of the innovations in microwave test instrumentation, including; the first automatic pulsed frequency counter (Model 451 and its successor the 58X series), the first source-locking frequency counter (Model 371 and its successor the 57XB series), the first frequency-selective,heterodyne, microwave frequency counter with YIG filtered inputs (Model 54X and others), and the first mm-wave frequency counter as well as the current (Model's 588C/598C) highest frequency (170 GHz),mm-wave counters available.

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