The WTA 140-220 | 4700061 from Radiometer Physics GmbH is a Waveguide Attenuator with Frequency 140 to 220 GHz, Average Power 0.1 W, Attenuation 0 to 40 dB, Insertion Loss 0.3 dB. Tags: Calibrated Attenuator. More details for WTA 140-220 | 4700061 can be seen below.