The numerical values displayed next to each triangle indicates the partial (1 being the fundamental), along with the deviation of the frequency from the ideal values due to inharmonicity (and stretch). Since all stretch is applied relative to A4, the display for A4 shows 0.00 deviation for the A4 fundamental. All other notes will show a non-zero value for the fundamental (assuming it is displayed) that reflects the stretch. The differences for the higher overtones indicate the degree of inharmonicity (in cents) added onto the stretch applied to the fundamental.
The table below shows the measured frequencies of the A4 fundamental and overtones (obtained as described
) compared to the ideal values assuming no inharmonicity. The difference between the measured and observed values is shown in the third row (in cents). These values are equal (within expected error) to those shown on the Verituner above for A4 on the same piano (a Steinway B).