1pc 3In1 Bike Chain Wear Indicator Chain Checker Ruler Portable Caliper Cycling

Chain Wear Indicator with Chain Hook
A worn out chain will rapidly wear chainrings and cassettes so it is vital to monitor the condition of your chain
This tool measures % elongation of the chain to determine amount of wear present:
0 - 0.5%: zero to minimal wear
0.75%: chain partly worn, approaching limit
1%: chain requires immediate replacement
Also features:
Chain hook to assist chain breaking & removal
Bolt gauge for M3, M4, M5 & M6 bolts
Ruler for measuring bolt length
Weight: 39g

Package Includes: 1x Ruler