This is a digital-CEM ‘Chain Stretch Measuring Tool’, a system which lets you measure chain stretch, enabling you to determine the exact percentage of chain wear. This way you can decide if chain replacement is required, or not. The system works by digitally measuring the total length of 20 chain links. Works on all 400 series (420 & 428 chains) and 500 series (520, 525, 530 & 532 chains). Includes the digital measuring device, tensioning device, a calibration gauge and a line laser.
