CD/CM (Current Direction and Current Measurement) Clamp. This is used to identify individual utilities in congested areas. It provides positive identification when used with a CD signal and can also provide current measurement of a transmitter signal to further identify individual utilities. For CD information and identification a RD8KPD(B) and Tx-10(B) transmitter are required. If only current readings are required, this clamp can be used with all locator models over the range of transmitter signals.