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The step is the difference in surface level where the closed lid meets the base. The seam gap is the distance between their edges. A compact may have a visible gap while the outer surfaces align, or a small gap with one surface standing proud. Agree on which dimension is being checked and whether the design calls for flush surfaces, an intentional offset or different values at different points.

Use fixed locations and a consistent closure state

Close the compact normally on a stable support with the intended insert and other internal components in place. Measure the step at defined points near the hinge, latch and sides. Use the same reference direction and record the sign of the offset. Avoid rounded corners or define exactly where on the curve to measure. A light touch or a suitable optical method helps prevent the measurement from bending a thin lid.

Look for the pattern across units

A consistent offset around the case suggests a different follow-up from an isolated high point near the latch. Compare the readings with the approved drawing or sample. If the team suspects an assembly issue, check seating and repeat the measurements with the agreed configuration. For durability, record the same locations before and after a separate cycling test. A single flushness reading describes the current fit.

Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information: sambound.com.

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SamBound New Material Technology Company Ltd.

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