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The Tektronix 017-053 is a 50 Ω to 125 Ω, 1 W resistive impedance matching adapter with GR-874 connectors. The 017-052 is the same with a 0.5 W rating, as is the 017-055 with 2 W.

It was shipped as a standard accessory with the 519 1 GHz oscilloscope that had 125 Ω input impedance.