The 8478 B Thermistor Mount is an RF power sensor head that is compatible with the 431 and 432 series and the N432A RF power meters. Its frequency range is 10 MHz to 18 GHz, and its power range is -30 dBm to 10 dBm. Maximum power is not to exceed 30 mW (+15 dBm) average power or 5 W*microsecond energy. It has a Type N male input connector.