The diatonic scale is based on the C- major I chord familiar to piano players and consists of the notes C, E, and G, which sound particularly harmonious when vibrating together. The diatonic scale adjusts these notes so that their frequency ratios are exactly 4:5:6, the frequency ratio that produces the most harmonious C-major chord.
Nontarnishing forks are made from lightweight tempered aluminum alloy
Each fork is stamped with scale letter and frequency
All forks are tuned to within ±0.5% of the frequency stamped on the fork when operating at a temperature of 22°C