The 8310-35-R-E from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 3 GHz, Attenuation Range 127 dB, Attenuation Step 1 dB, Power 50 W, Insertion Loss 6.0 dB. Tags: Benchtop, Rackmount, Programmable, Digital, Computer Controlled. More details for 8310-35-R-E can be seen below.