8494A Manual Attenuator, 4 GHz, 11 dB, 1 dB steps 8494B Manual Attenuator, 18 GHz, 11 dB, 1-dB Steps 8495A Manual Attenuator, 4 GHz, 70 dB, 10 dB steps 8495B Manual Attenuator, 18 GHz, 70 dB, 10-dB Steps 8495D Manual Attenuator, 26.5 GHz, 70 dB, 10-dB Steps 8496A Manual Attenuator, 4 GHz, 110 dB, 10 dB Steps 8496B Manual Attenuator, 18 GHz, 110 dB, 10 dB Steps