Motool 3080-300 Slacker Street Kit Slacker Digital Sag Scale -Digital Sag Scale reads sag in real time using a retractable slacker cable -Built in Display allows a helper/mechanic to easily read measurements -Remote display allows a single person to easily take accurate measurements -Universal mounting works on forks and shocks. -The best way to set up new generation SFF and TAC Air forks. -The easiest most accurate sag scale available