The Rohde & Schwarz NAP Power Meter displays incident and reflected power directly from an integral directional coupler. Derived measurements may also be displayed, including VSWR, reflection coefficient in % return loss in dB, the ratio of reflected to incident power, and modulation depth in %.The NAP has a dual display of incident and reflected power in either Watts or dBm. The unit can also display the following: VSWR, Reflection Coefficient (%), Return Loss, Modulation Depth (%), and Reflected/ Incident Ratio (%). The NAP uses the NAP-Z4 power sensor (sold separately).