Originally Posted by
habilis
A better way to measure is with a 12" ruler. Your method of measure is less precise because "stretch" will be more evident over a longer distance.
I have a good-quality metal ruler. I have a hard time measuring chain stretch with the necessary precision (I discard at .5% stretch.) when mounted. And I have no chance of measuring it to ,03mm precision. The extra precision of the digital caliper makes it superior. Plus it applies stretch itself as well as anchors itself between the points it measures. But, obviously, I have been careless about placing its jaws in the same place on the pins.