The SPB-TP-20dB-TBBS is a -20dB down directional test point that may be used in most C-COR Amps that use the SPB Series PADs. It can be used to measure or inject RF signals ( 5 to 1000 MHz) in the Forward or Return Pad locations. It has a 1dB through loss (like using a 1dB pad) and a 20dB loss to the test point .