A Finer Display Does Not Guarantee Repeatable Measurements

An instrument that displays smaller increments can still give a wider spread when the same part is measured repeatedly.

The display increment is the smallest step shown on the screen. Measurement repeatability describes the variation observed when the same item is measured under the same stated conditions.

Repeat the measurement the way it is used

Use a stable part or representative artifact and repeat the entire measurement, including removing and reseating it if that is normal practice. Keep the feature location, instrument, operator and procedure fixed for this comparison. If the part is compliant, control contact force and support. A reading that changes when a thin part is handled differently is not explained by the last digit alone.

Use the variation to judge suitability

Compare the repeated readings to the distinction the inspection needs to make. A display with many digits can show a finer increment than the setup can reliably distinguish. Conversely, a coarse display can hide small changes. Check the method on representative parts before deciding that a new gauge or a finer readout will improve the inspection.

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