MILLTRONICS Test Chains Roller test chains are used for belt scale calibration reference when material tests are not practical. All tests chains are bushed. . Chain weight/foot: 70 lb/ft (104.2 kg/m) Chain length: 70 lb/ft (104.2 kg/m) 4 ft (1.2m) – 7 ft (2.1m) . Total chain length: specify in plain text description (XXXX mm)