Wood sound: the hammer test
Strike the piece with a hammer, three taps one second apart, in the same spot. The phone listens, measures the pitch and how fast the sound dies out, and keeps the result. Once you know what the piece was hiding (cut, probe, core), note it: that is what calibrates the sound for THIS species.
A sound is a hint, not a grade: it replaces neither the probe, nor the cut, nor the stamp of an accredited grader.
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The test opens with your email, like the survey.
Your email to open the designer
Because your frame is saved under your email, and that is where your set will be delivered.
Protocol: same hammer, same spot, piece on two supports, phone 30 cm away. At least 8 sound AND 8 rotten measurements per species before a threshold is announced.