I bought official Samsung adapter from their website, it is the one specifically listed for the Tab 3 8. Here is how it's advertised:
This Micro USB to USB connection pocket-size device turns your Galaxy Tab into a USB host, allowing you to connect compatible USB accessory devices such as keyboards, mice, thumb drives and more to your Tab.
When it arrived yesterday, the manual lists two compatible devices: USB memory stick and a Samsung laser printer. Needless to say, I am very disappointed & hope I can return it.
This Micro USB to USB connection pocket-size device turns your Galaxy Tab into a USB host, allowing you to connect compatible USB accessory devices such as keyboards, mice, thumb drives and more to your Tab.
When it arrived yesterday, the manual lists two compatible devices: USB memory stick and a Samsung laser printer. Needless to say, I am very disappointed & hope I can return it.