Description This pool cue straightness tester is designed to ensure your cue is perfectly straight, enhancing your game performance. The tool features a unique ferris wheel design that allows for precise concentricity detection and calibration. Ideal for both professional players and enthusiasts, it helps maintain the optimal condition of your cue. Features -Color:Black -Material:Alloy -Size:6.50X3.00X2.00cm/2.55X1.18X0.79in -Precision detection: accurately measures the straightness of pool cues to ensure precise shots and improve game performance -Ferris wheel design: comprehensive concentricity detection allows for easy correction -Versatile compatibility: the pool billiard cue straightness checker is designed for snooker and cues -Portable design: convenient for quick detection and adjustment anytime, anywhere, making it practical and user-friendly -High precision calibration: extends the lifespan of pool cues by maintaining optimal straightness and feelPackage list: 1 x pair of billiard club calibrator