It's £6.98 (finance options may be available), so what do we think of it...
From the bicycle tools category: This chain wear indicator gauge should be used periodically to measure how much a chain has worn and stretched, ensuring it can then be replaced before it has caused any additional wear to the components that it runs on. A worn chain can be noisy, cause running and gear shifting issues and prematurely wear out sprockets and chain rings which can be costly to replace
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