The WTA 220-330 | 4700038 from Radiometer Physics GmbH is a Waveguide Attenuator with Frequency 220 to 330 GHz, Average Power 0.1 W, Attenuation 0 to 40 dB, Insertion Loss 0.5 dB. Tags: Calibrated Attenuator. More details for WTA 220-330 | 4700038 can be seen below.