The 8481B Power Sensor has a power range of 1mW to 25 Watts and operates over a frequency range of 10MHz to 18GHz. The sensor is designed for use with the EPM-441A, EPM-442A, HP 435B, 436A, 437B, 438A, 70100A and E1416A power meters. The unit uses a Type-N (male) connector.