A digital caliper / micrometer-style gauge captures diameter & thickness to hundredths of a mm—critical because fakes sometimes compensate weight with extra thickness or width while staying close on the scale.
Always measure dust-free coins with gentle jaw pressure—over-squeezing distorts readings.
Quick contrast matrix
- Weight (0.01 g) + ⌀ + thickness vs mint specs = affordable triage.
- Localized rim variance can hint at filing—rotate under raking light.
- Log measurements when sourcing repeating lots.
Instrument care
Remove batteries for storage; keep racks clean; use gauge blocks if supplied.
Amazon
Pick models with large LCD, mm/in, rigid case—skip ultra-cheap wobbly jaws.
- 0.01 mm resolution is enough for modern bullion.
- Pair with scale at a permanent verification station.
- Affiliate-ready.
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