Its high precision bubble level ensures that you get the most accurate reading every time. The more you use it, the better your putting game will be. Efficient Golf Ball Marker: Helps play by quickly and accurately identifying the slope of the green. Works with any type of putter and is suitable for use on any green. Simply place it behind your ball and read the slope of the green. With practice, you'll be able to adjust your putting game and sink more putts. Boosting Golfer Confidence: By accurately reading the green, this product can help boost your confidence on the course and improve your overall game. Other golfers will notice your accurate green reading and improved putting performance. It's the perfect accessory for any golfer looking to improve their putting game. Color: Blue Material: Zinc Alloy Package Contents: 1 x Slope Reader Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.