Pocket Pinger - Coin & Bullion Tester

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I designed and 3D printed a ping tester. More info in comments

Precious Coin Tester - Apps on Google Play

Pocket Pinger - Coin & Bullion Tester

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Precious Coin Tester - Apps on Google Play

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How to use the Pocket Pinger to test coins! In-Depth Review

Pocket Pinger - Coin & Bullion Tester

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I designed and 3D printed a ping tester. More info in comments