I think what BMMF is hinting at is that the tool will (probably) tell you at what point you should replace.
We have a CC2 in the workshop at work which states replace before you get to 1%.
I find that the closer a chain is to .5% when it's replaced, the better the new one meshes with the cassette and chainring etc.
If the old chain is at 1% then you're looking at a whole drivetrain replacement to get it running nicely.
@M_V started
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I think what BMMF is hinting at is that the tool will (probably) tell you at what point you should replace.
We have a CC2 in the workshop at work which states replace before you get to 1%.
I find that the closer a chain is to .5% when it's replaced, the better the new one meshes with the cassette and chainring etc.
If the old chain is at 1% then you're looking at a whole drivetrain replacement to get it running nicely.