He tested the point of the scissors with his thumb and then looked at me.

I glanced at the knife in my hand, and tested the point with my thumb.

To test ripeness, press the skin lightly with your thumb.

He ground on steadily, first one side of the blade and then the other, halting occasionally to test the edge with his thumb.

He drew his sword and tested its edge with his thumb.

He tested the blade with his thumb; it was sharp enough to do the trick.

He had his sword out, testing the edge with his thumb.

The man drew his sword, testing the edge with his thumb.

"Not very sharp," he said, testing it with his thumb.

Then he tested the sword edge with his thumb.