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Windows

Open the Device Manager, one possibility is to use the Task Bar as described below:

In the Device Manager, expand the Ports node and look for the one with a description that identifies the attenuator:

Right-click it and access its Properties, click the Details tab and select the Device Instance Path option, the serial number is enclosed in a red rectangle in the image below:

The serial number for the attenuator in this example is R246744.