Coin Pinger

Acoustic ring test for bullion — private, on-device

How to test: hold the coin flat on a fingertip (touching as little as possible) or set it on ping plyers, then hit its edge with a striker to make it ring clearly, close to the microphone. Don't use a fingernail — it damps the ring.

Your browser kept voice processing (echo cancellation / noise suppression) enabled on the microphone — common on iPhone/Safari. Frequency readings usually still work, but ring volume and sustain may be distorted.

build v37