Power measuring devices are waveguide components used to couple power from the waveguide system to measure power, frequency, and other system parameters. These devices include directional couplers and power meters. Richardson Electronics supplies various types of resistive loop directional couplers to meet many microwave system requirements: One type uses the loop coupler terminated in a 50 Ω load with a coaxial connector measuring port to connect directly to a user provided power meter. Another type incorporates a microwave diode to the loop coupler to provide a scaled DC voltage to drive a supplied analog meter box. Additionally, Richardson Electronics supplies power meters that are both convenient and highly adaptable. This power meter automatically corrects for temperature and provides analog and digital linear signal outputs with multiple interface options.