Model STA-60-06-S1 is a dual function, direct reading and programmable rotary vane attenuator for waveguide systems operating from 110 to 170 GHz. With an exceptionally flat frequency response, the attenuator is accurate to within 0.15 dB or 3.5 percent, whichever is larger, up to 40 dB. The maximum attenuation is 60 dB. Manual operation is enabled by large rotary dial and a digital LCD readout. Programmed control is achieved using an internal motor that quickly responds to attenuation commands received over a USB connection.