The new dual-purpose, double-sided Advent 2in1 gap tape means that internal areas, like window frames, internal door frames and other awkward spaces, can be measured in the same way as normal surfaces.
The 2in1's case dimensions are already taken into account on the reverse of the standard measurement blade meaning internal measurements can be taken quickly and easily.

Simply lock the blade at the extent of the gap to be measured with the back of the tape against the opposite edge. This will give an accurate reading on the tape without the need to make any adjustments.

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