Building Your Toolkit
A modest investment in the right tools catches the vast majority of counterfeits.
Essential Tools (Under $75)
- 10x triplet loupe ($15–$40) — The most important tool. Hastings triplet or BelOMO 10x.
- Digital scale ($15–$25) — Accurate to 0.01g. AWS or Smart Weigh brands.
- Digital calipers ($10–$20) — Measure to 0.01mm.
- Rare earth magnet ($5–$10) — Identifies iron/steel-core fakes instantly.
Intermediate ($75–$300)
- USB microscope ($30–$80) — 50x–200x with camera. Excellent for surface examination.
- Fisch detector ($50–$200) — Tests diameter, thickness, weight, reeding in seconds. Great for coin shows.
- Sigma Verifier ($250+) — Electromagnetic composition testing through holders. Gold standard for bullion.
Systematic Authentication Process
- Visual inspection — does anything feel "off"?
- Magnet test — any attraction = fake (for US coins).
- Weight — compare to published specifications.
- Diameter — should match within 0.2mm.
- Magnification — check for porosity, seam lines, tooling.
- Edge examination — reeding count and quality.
- Sound test — for silver coins.
- If uncertain — submit to PCGS or NGC.
Up Next
This guide is for educational purposes. Where official standards, grading services, organization memberships, or legal requirements apply, consult the primary authority named in the references below or the relevant government agency.
Reviewed on February 15, 2026 by the US Coin Shows editorial team. Editorial policy
Official references and further reading
Frequently Asked Questions
What tools do I need to authenticate coins?
Essential (under $75): 10x loupe, digital scale (0.01g), digital calipers, and rare earth magnet. These catch most counterfeits.
What is a Sigma Verifier?
Uses electromagnetic waves to test metallic composition through plastic holders without contact. The gold standard for bullion authentication ($250+).
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