Description: 【360° Accuracy Alignment Aid】: Electronic Golf Ball Liner supports all round rotation and line drawing, easily draw clear reference lines on the surface of golf ball, help players accurately align the hitting direction, and improve training effectiveness 【Weighing Design】: This Golf Ball Line Marker Tool features a weighing ball cup on bottom to accurately weigh golf ball. Verify your balls are consistent and meet official competition standard, making it an essential tool for professional training and ball equipment testing 【Compact & Portable Design】: Train anywhere, anytime. 19.5cmx19.5cmx15cm/7.68inchx7.68inchx5.91inch, this Golf Ball Marker is designed for portability. Easily slip it into your golf bag for use at the driving range, practice, or keep it at home for convenient practice sessions 【For Golfers of All Skill Levels】: Whether you're a seasoned professional, a dedicated amateur, or a beginner learning the game, this Alignment Tool is designed to improve your performance. It's an ideal aid for personal practice, coaching sessions, and pre round warm ups 【Construction & What You Get】: Built from PP material to ensure long term durability through practice sessions. The package contains a Golf Ball Liner Size Chart: 19.5cmx19.5cmx15cm/7.68inchx7.68inchx5.91inch Package Includes: 1 Electronic Ball Liner(with a marking pen) Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.