Logitech NuLOOQ - Manual (Page 35)

Gently
gliding your finger clockwise on the tooltuner dial will
increase the current option value in increments of one. The
faster you glide you finger on the tooltuner dial, the faster the
value will change. For example, if you are adjusting the brush
size, place your brush directly on the object for proper sizing.
When adjusting values, you'll notice the value in the NuLOOQ
dialog box change. You may not see the value in the
Photoshop CS2 option bar change until you stop using the
tooltuner dial.
Gently gliding your finger counter-clockwise on the tooltuner
dial will decrease values in increments of one. The faster you
glide you finger on the tooltuner dial, the faster the value will
change.
To exit this value control mode, just press the button at the top
and the dialog box will disappear and you can continue using
Photoshop.
Usage Recommendations