Sewing - a measurement tool, particularly for setting and checking seam allowances.
Seam gauges come in one of two forms:
- A small metal ruler with a slit down the center. In the slit is a sliding plastic piece. The whole assembly acts like a set of calipers.
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/|- | | | | <- plastic slider
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- A cross-shaped metal plate, each of whose arms is a standard length. The lengths correspond to the commonest seam allowances.