Everything you need to set up your turntable. Get the out of your equipment and hear your music exactly as it was meant to . These tools will enable you to set your vertical tracking force, headshell alignment and vertical tracking () so that you records sing like never before. Includes a alignment protractor, azimuth, tonearm force gauge and a spirit level.You need to prepare two pieces of ag12 button cell by yourself. Correct force is important for ensuring accurate playback and extending the life of your valuable records and cartridge.