The Keysight / Agilent / HP 11812A consists of a step attenuator, two 10 dB pads semi-permanently attached, a cable, and a carrying case. The 11812 is calibrated against the piston attenuator and is specified to verify the performance of the 8902A Option 050 Tuned RF Level function to ±(0.015 d + 0.010 dB/ 10 dB step).