This unit covers the entire spectrum from 1.8 to 150MHz with 5% accuracy. Performance on medium wave is acceptable making this unit very usefull for our AM MAX transmitters as well. The large meter scale is calibrated for forward and reverse power and standing wave ratio (SWR). Switch selectable average (AVG) and Peak Envelope Power (PEP). The meter has three power ranges that are switch selectable as indicated (15W/150W and 1500W). This meter can accurately read power levels as low as 50 milliwatts! Inputs and outputs are 50 ohm impedance using SO239 connectors.