Wacom - Bamboo Stylus Solo for Apple® iPad®, iPad mini, select Android tablets and Kindle Fire - Silver
Write, draw and navigate features on your compatible device's capacitive touch screen with this Wacom CS160K Bamboo Stylus Solo, which features a carbon-fiber tip to promote accuracy. Polished anodized aluminum material lends a stylish look.
Logitech M570 Wireless Trackball Mouse: Easily use your computer for long periods of time with this trackball mouse, which allows you to precisely navigate features with minimal wrist movement. Enjoy lasting comfort thanks to the sculpted shape, which supports the curves of your hand.
Overall a good mouse especially if you don't want to be chasing a mouse around your desk. Easy to use, smooth ball action and being wireless makes it easy to customize your work space. Only down side is that it is right hand only you can't switch between a right and left handed control mouse.
Logitech M570 Wireless Trackball Mouse: Easily use your computer for long periods of time with this trackball mouse, which allows you to precisely navigate features with minimal wrist movement. Enjoy lasting comfort thanks to the sculpted shape, which supports the curves of your hand.
Trackball
Does trackball operation involve the thumb? Possible arthritis in thumbs?
Yes you use your thumb a lot - I probably would not get one if you have severe arthritis in your thumb