24×24 Pixel Cursor Bookmarklet
I have made a bookmarklet that will turn your cursor into a 24 × 24 pixel square, which may help in building and testing conformance with the proposed 2.5.8 Success Criterion.
Finger-Friendly Design: Ideal Mobile Touchscreen Target Sizes — Smashing Magazine
How to design for touch
Provide buttons with a large target size - Access Guide
Touch Targets on Touchscreens