The Series 024 from Flann Microwave are USB-Controlled Variable Attenuators that operate from 33 to 500 GHz. They have an attenuation range from 0 to 50 dB with a resolution of 0.04 to 0.19 dB and an attenuation flatness of ±10%. These attenuators can handle an input power of up to 230 mW and have an insertion loss of less than 0.7 dB and a VSWR of less than 1.25:1. They are available in a module that measures 62 x 34 x 36 mm and have a USB interfacing port with WR3, WR4, WR5, WR6, WR8, WR10, WR12, or WR15 waveguide interface options.