The Agilent R8486A thermocouple power sensor is designed for use with the EPM, EPM-P series, 70100A, E1416A and the discontinued 43x power meters, and provides extraordinary accuracy and stability. The R8486A power sensor gives you extremely low SWR even at mm-wave frequencies, and is traceable to the U.S. National Institute of Standards and Technology (NIST). A 50 MHz calibration port is included with the power sensor for calibration with the power meter. This calibration provides traceability to NIST at millimeter-wave frequencies, and it eliminates the uncertainties due to temperature changes and the variance in making measurements with different meter/sensor combinations.