Portable and compact design for easy storage and transport. Fits in most tool kits. Onehanded operation enables fast, singlehand checks. Circulating Chain Inspector is a practical tool for checking chain wear length. It helps you determine when a chain needs to be replaced or serviced, improving ride reliability and reducing the risk of drivetrain damage. Chain hook design provides secure handling during inspection and maintenance. It keeps the chain in place and makes adjustments easier. Bicycle chain gauge constructed from aluminum alloy for long term use. Durable, lightweight, and resistant to corrosion to withstand regular maintenance. Designed for typical bicycle chains and everyday use. A reliable accessory for routine maintenance, preride checks, and testing. Use scenarios Home maintenance after rides: quickly assess chain wear length to decide if replacement is needed before the next ride. In a bike or stand: perform fast, accurate chain wear checks to guide maintenance decisions and estimate service intervals. Preride preparation for long rides or mountain biking: verify chain wear to ensure reliable performance and reduce the chance of chain failure during the ride.