The Pedros Chain Checker Plus II for checking your chain for wear - one of the simplest things any cyclist can do to maintain drivetrain performance and minimize maintenance costs. The Pedro's Chain Checker Plus II makes this task quick and easy offering a simple check of 0.5% and 0.75% chain wear. To ensure the maximum life from your chain and accuracy of measurement, the tool employs a three-point design which properly isolates pin wear from roller wear. Other two-point designs do not and can incorrectly indicate a worn chain, robbing the user of additional miles and money. Pedros Chain Checker Plus II Features Includes a chain hook tool, perfect for simplifying chain removal and installation Chainring nut wrench included, essential for removal and installation of chainrings