Sewing - a measurement tool, particularly for setting and checking seam allowances.

Seam gauges come in one of two forms:

  1. 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.
     _________
     \   __   |
      |- | |  |    <- ruler
      |- |_|  |_
     /|- | |  | |  <- plastic slider
     -|- |-|  |-
      |- | |  |
    
  2. A cross-shaped metal plate, each of whose arms is a standard length. The lengths correspond to the commonest seam allowances.

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