Quote:
Performing The Test
Thumb Pad Test
Hold the razor in your dominant hand and aim the edge upward.
Place the fingers of your off hand along the downward facing spine for absolute control over how your thumb contacts the shaving edge.
With a moistened thumb pad, draw your thumb very gingerly across, not along, the edge repeating all along its length to feel how it grips or bites into your thumb print.
Then there is a picture to the right showing the holding position and an arrow pointing showing illustrating the direction.