February 19, 2025 1 minute to read February 19, 2025 1 minute to read Marketed by Martins Industries, the Checklink combines a wheel nut loosening indicator and a retaining device, allowing it to signal any nut movement while also helping to keep them in place. The Checklink will also melt to indicate any wheel overheating issue, signaling a problem in the hub or braking system. Depending on the chosen version, the device will melt at either 125 degrees Celsius or 165 degrees Celsius.