A.R. Directional Coupler DC7154 manufactured by AR RF/Microwave Instrumentation is a high-power dual directional RF coupler designed for accurate monitoring of forward and reflected RF signals in test and EMC environments. The unit operates across a wide 0.8 GHz to 4.2 GHz frequency range with a 50 dB coupling factor and supports up to 400 W of power. Its dual directional design allows reliable measurement of signal levels while maintaining low insertion loss in the main transmission path. The DC7154 is commonly used with RF amplifiers, power meters, oscilloscopes, and spectrum analyzers for laboratory testing, amplifier monitoring, and EMC measurement systems.

Used- has some wear and tear (as you can see), but still in good working condition.