The Mechanically Variable Attenuator from JPT Electronics is a Fiber Optic Attenuator with Attenuation 0 to 40 dB, Insertion Loss 0.3 dB, Operating Temperature 0 to 60 Degree C, Polarization Dependent Loss 0.1 to 0.3 dB, Return Loss 50 dB. More details for Mechanically Variable Attenuator can be seen below.