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An electronic test equipment coupler is useful for reflectometer applications, attenuation measurements, power measurements, microwave measurements, network analysis, and source leveling, to name a few. There are many types of couplers for different applications: optical couplers, directional couplers, coaxial directional couplers, waveguide couplers, hybrid couplers, and reflectometer couplers. Different couplers have different functioning capacities and uses. Once you know which coupler you need, browse ValueTronics.com for superb quality used and refurbished products from top brands.