Technasonic Check-Go Sweet Spot Finder

from Tracy

Spins much faster than I thought it would. Good quality.

from Widnandrain

Works great. Draws a nice line when using the bottom cup.

from P

Great tool for aligning balls

from Cully

this puts a consistent line on the ball in the same spot every time. whether that affects the playability, i don't know, but I'll take every tiny edge i can get. four stars because you can't use a sharpie with it

from Flashdrivereview

Difficult to get a thin and clean line. May be the pen is too soft or the rotating disc is wobbly. Still a good product but both the machine and additional pens are a little too expensive.