Did you attempt any research yourself?
According to the web site that chain requires special tool and a unique set pin
Assembling and disassembling Campagnolo 11 speed chain
As I suggested in my comment I think you have your priorities wrong if you a looking to buy a chain tool for road repair before you have even changed the first chain.
As for measuring the chain and chain maintenance have you referred to the manual?
It specifically states all assembly and disassemble should be preformedperformed with the special tool.
The manual has instructions on how to measure stretch.
From what you read it is hard to measure. Why would you not include the manual in your research. Not voting you down but in the future please perform basic research before posting.?
