The Keysight 11878A adapter kit contains four high-quality RF adapters that provide a reliable connection between 3.5 mm and Type-N connectors. It includes one adapter each for 3.5 mm (male) to Type-N (male), 3.5 mm (female) to Type-N (male), 3.5 mm (female) to Type-N (female) and 3.5 mm (male) to Type-N (female). These adapters are designed for the frequency range from DC to 18 GHz and are ideal for precise measurements with network analyzers when testing SMA or 3.5 mm devices with a Type-N configuration. The kit is supplied in a practical storage box and also includes an operating and service manual.