Golf Ball Balance Checker Check Go Pro CHECK GO PRO Golf Ball Centering & Gravity Check Line Marker This device quickly spins the ball to find its center and draw lines. Utilizes physics to find the golf sweet spot, perfect for improving putting accuracy. Selling because I don't use it. No operational issues. The instruction manual has some writing on it, but the main unit is clean. A putting guide (unused) will be included as a bonus, as shown in the last photo. This is a used item. Please understand this before purchasing. - Brand: Check-Go - Model Name: Check-Go Pro - Function: Sweet Spot Finder - Features: Performance improvement using physics - Application: Improves golf driving and putting accuracy - Accessories: Box, instruction manual, batteries included