There are mainly two differences.
First, compared with the Tens Pads, hand cylinders have a broader contact area with the skin. Also you can do a foot bath with the hand cylinders, dipping them in the water with the feet (obviously being careful not to allow the electrical contacts anywhere near the water!) thus increasing the contact area with the skin even further.
Second, the Tens Pads hold better for long programs than trying to hold the cylinders, except when using a foot bath.
Please use them based on your situations.
For more details, please check the link: