The RPR4006R is the first member of the RadiPower® 4000 series power meters, offering excellent RMS measurement accuracy and high measurement speed, even at low power levels. True RMS | To ensure accurate power measurement of non-sinusoidal RF signals over the entire measuring range, the RadiPower® 4006R uses a true RMS detector. This detector leads to a DC voltage proportional to the RF RMS value of the input signal, resulting in higher accuracy and faster measurements.