How do you measure a gap too narrow for the tool body?

Windows
Layout
Accuracy

A reveal, a shim gap or a channel in a window frame is often narrower than the tool measuring it, which normally means holding the body clear and adding the offset in your head. The T1R Range has a rear extension that folds out and is accounted for automatically, so the tool sits where it fits and the number on the display is still the number you wanted. Nothing is added afterwards, which is where that kind of error usually enters.

How the offset gets handled

Reveals are narrower than the tool
Fold the T1R rear extension out
Its length is accounted for automatically
No offset added in your head afterwards
T1R Range reads the number you wanted

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The rear extension is folded out of the back of the tool on a workbench, shown from both sides. The tool is then used on a window frame from inside, the blade run into a narrow channel alongside the glass with a brick building visible outside. The display steps through readings including thirty-seven and a half.