I'm measuring actual center to center of the pin, using a digital caliper, and I measured at 3 or 4 different sections of the chain. This was several months ago and I've already tossed this chain. This is how you measure accurately while excluding roller wear: take 2 measurements and subtracting them (A-B) will give you a measurement from the same sides of the roller. I have both a cheap chain wear tool that measures opposite sides, which shows me 0.75% wear, and the Shimano chain wear tool which measures the same side and shows me just barely passing, which I assume is just a little bit below 0.5%, but it's a pass/fail tool so it won't tell you the actual wear. The digital calipers with A-B measurement gave me somewhere between 0.45 to 0.50% at various sections of the chain.