The full-scale current of a galvanometer, often referred to as the "full-scale deflection current," is the maximum current that the galvanometer can measure without damage. This value is specific to each galvanometer model and is typically found in the device's specifications.
To determine this value, you can often refer to the manufacturer's documentation or the calibration markings on the instrument. If you're working with a specific galvanometer, let me know, and I can help you find more precise information!