Compatibility: It is compatible with most bicycle chains on the market and complies with EU chain production standards. Compatible with single and multi-speed transmissions, solve the incompatibility problem of bicycles perfectly. [Accurate Detection]This tool quickly checks the stretch and wear of the chain to determine whether a chain is good or bad. Precision and durable to fix most problems of bikes. [High-quality materials]Made of high-quality 304 stainless steel and is durable with an integrated CNC processing method. Practical bicycle tool: the bicycle chain wear indicator is a useful tool for bicycle maintenance and can help to prevent worn chain breakage or damage other parts. Precautions: when the wear of 0.75 = 75% is reached, the chain must be replaced soon. If the 1.0 = 100% wear is reached, the chain must be replaced immediately. Specifications: - Features: Detection of chain damage. Chain hook / screw measurement. Disassembly of the Presta valve nut. Disassembly of the Presta valve extension rod. Disassembly of the Presta valve core. - Six in one function: 0.5% 0.75% 1% 3 lever test. Specification: -Material: 304 stainless steel and CNC machining. Color: silver Size: 125x45mm - Contents: 1 x chain tester.