We all thump watermelons and nod like we heard something. It isn't folklore: ripe fruit is softer inside, so it rings lower — a gap of a few semitones, too small to hear.
Thump 3 times, tap its rough size, get a 1-10. Optionally photograph the field spot and it reads that patch's exact colour and the rind's webbing.
It measures ripeness, which correlates with sweetness — a phone, not a lab. Rate one after cutting and the scale re-fits to your melons.
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