The Keysight / Agilent / HP 8487D diode power sensor is designed for use with he EPM series, EPM-P series, 70100A, E1416A and the 43x series power meters, and provides extraordinary accuracy and stability. The 8487D power sensor measures the average power over its entire -70 to -20 dBm dynamic range which gives you accurate readings even if your test signal is subjected to multitone environments, modulated carriers, or carriers with high harmonics.