KMC Digital Chain Checker, Black/Silver

KMC has developed this special digital chain wear indicator, The 'digital chain checker'. accurately measures in inches or millimetres accurate to one hundredth of a millimetre measures up to 2.5mm of elongation fits all chains including 12 speed metal with large LCD display uses a 1.5V watch battery (included) 1 year warranty ** "a battery-powered chain checker. It gives accuracy to one hundredth of a millimetre, so if you want to keep a very precise eye on your chain wear, you'll appreciate this tool. We found It complicated to set up, but once done it is very accurate." - Cycling Plus **.