Originally Posted by
Retro Grouch
If I decided to start using my chain checker again, the first thing that I would do would be to calibrate it against a brand new, never used chain.
I have used my Park CC-3 to test a brand new chain and, as expected, it shows no wear. Since it's a go/no go tool with only 0.75% and 1.0% elongation gauges it takes a fair bit of wear to show "failure". My 12" ruler allows much more subtle measurements.