The input voltage is not the primary concern. If you have a 240v to 120v adapter, that is fine, but it would be the output voltage that matters, as well as the amperage.
Most adapters can take 120-240 volts, as listed on the printed info on the adapter. But if the output voltage and amperage are too high, it could damage the device.
I am sure you can find a samsung 240v adapter for their devices, as popular as they are worldwide.
It's not wrong to fondle the s pen.