Originally Posted by
pdlamb
Yes, I've got one. I use it (the barely worn end) to see if it's time to roll the bike out of the garage, get the tape measure, and get down near the ground to see if the chain needs to be replaced. The real benefit is I can use the Park tool without getting my eyeballs near the ground.
That's pretty much my approach. If it ever indicates a worn chain, I can measure and check the actual accuracy of the tool. In the meantime, it's quick & clean.