Originally Posted by
Kontact
The rollers have zero influence on how elongated the chain gets from pin and link wear and absolutely will not show up if you measure the chain with a ruler. Pin to pin distance is entirely a measure of how the inner links and pins contact each other. Having a ring around the two won't change that.
You can disassemble the chain and remove all the rollers and it will be the same length when you put it back together without them.
Again bringing up the Campagnolo hard recommendation, just as a quality chain checker takes in any roller wear the Campagnolo measurement will as it measure roller to roller on a vernier caliper.