A digital caliper measures outer diameter and edge thickness without kitchen-tong squeeze—flat jaws should kiss metal lightly for a stable read.
Compare to official mint specs (mm diameter, mm thickness) to catch undersize copies even when weight is «close».
Scratch-free steps
- Diameter: jaws on outer rim, perpendicular to axis.
- Thickness: edge between jaws, coin level.
- Three reads; average if one outlier.
When caliper wins
On recent euros and waves, edge thickness exposes bronze under plate. Always pair with 0.01 g scale and magnet on suspects.
Amazon
mm display, rigid frame, case—dry wipe jaws, no oil.
- Cross hub `calibre-digital-micrometro`.
- Affiliate ready.
- Weight + Ø + thickness on buy sheet.
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