The simple way I have done it is to use a 12" steel rule (I use the one out of combination square). Stretch the chain tight and line up the "12" on the center of a rivet . Then look at where the "0" falls. If it on the rivit, you ok, if it falls short of the rivet, order a new chain. I don't know if this would work on a 10 or 11 speed cassette, but it works fine on my 7 and 8 speeds (14/21 speeds and 16/24 speeds)