Transmission Test Set 300kHz - 3GHz The Agilent (now Keysight) 85044A test set provides the capability to measure the reflection and transmission characteristics of 50 ohm devices. The device must be physically turned around to measure its reverse direction characteristics. This test set is used with the Agilent 8753A/B/C or the Agilent 8753D Option 011 only. Features: Provides the capability to simultaneously measure the reflection and transmission characteristics of 50 ohm devices Frequency range of 300 kHz to 3 GHz