Flann’s Precision Rotary Vane Attenuators are acknowledged by many to represent the ‘Industry Standard’ in precision waveguide Attenuators, offering high-accuracy with unsurpassed repeatability and reliability. The Rotary Vane Attenuator is the ideal instrument for use in waveguide systems where broad-band direct reading of attenuation is required, particularly as a standard for reflectometer and swept systems. Flann's Rotary Vane Attenuators provide the ultimate in attenuation accuracy, attenuation range and VSWR .