The WTA 325-500 | 4700035 from Radiometer Physics GmbH is a Waveguide Attenuator with Frequency 325 to 500 GHz, Average Power 0.1 W, Attenuation 0 to 40 dB, Insertion Loss 1 dB. Tags: Calibrated Attenuator. More details for WTA 325-500 | 4700035 can be seen below.