A linear measure shall:

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A linear measure must be reliable in how it contacts and defines a length. A smooth surface ensures the measuring edge makes clean contact without gouges or burrs that could grip the workpiece or on the scale itself, which helps prevent measurement damage and reading errors. Being straight and rigid prevents bending or flexing under handling or slight pressure, so the true length remains unchanged during measurement. Being open to a stop means the end of the measure can be pressed to a defined stopping point, giving a consistent reference or zero point for repeatable readings. When all three features are present, the instrument provides a stable, repeatable length with minimal variation due to surface imperfections, deformation, or ambiguous endpoints. If any feature were missing, accuracy could be compromised, so including all three is essential.