Item Type: Cartridge Alignment Protractor Tool Material: Acrylic Color: White Function: Eliminate Tracking Error; Adjust The Trailer Scope of Application: Vinyl Record Player Package List 1 x Protractor 1High Accuracy: High contrast cartridge calibration protractor provides better visibility and eliminates tracking errors. 2Premium Material: Made of high quality acrylic material, firm and strong, sturdy and durable, long service life. 3Superior Sound Quality: Eliminate tracking error; Adjust the overhang; Avoid overshoot distortion to maintain high quality sound. 4Easy Operation: Simple to operate, only this protractor tool link to turntable setup guide with instructions printed on the protractor. 5Perfect Fit: This cartridge alignment protractor is fit for 1/2 in mounted cartridge and can work with an S shaped arm.