Using SMA termination or Dummy Load is suggested for protection of the SMA port of your RF Explorer when the device is exposed to unwanted high radiation or strong electronic fields. For instance, if you carry on your RF Explorer that is exposed to an X-Ray scanner in the airport, you should remove the SMA antenna and plug a protection 50ohm SMA termination. It is also important for RF Explorer Signal Generator to prevent accidental RF power without a load.
See this article for more details on protection of your RF Explorer.
Wide broadband frequency application
Frequency range: DC - 6 Ghz
Impedance (Nominal): 50Ω
Power rating: 1Watt
Connector type: SMA male
Weight: 3 grams