Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
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Hand tension or the tension applied to the lower section of chain, while it's on the bike is enough.
FWIW, all of those chain checker tools are pretty much worthless. They don't check elongation or roller wear properly. If you really want to measure elongation, use a precision 12" scale. If you want to measure roller wear, use calipers.
Quite often a chain checker will show a chain to be .25% elongated when new. What it's measuring is the difference in the distance between rollers, which varies between brands.