The silk manufacturer Johann Heinrich Scheibler invented a method to tune keyboards with unprecedented accuracy, applying principles that he had developed in his textile factory. His technique involved a set of tuning forks called a tonometer, a chronometer, and the counting of beats. It aimed to deskill tuning so that anyone could achieve precise tuning regardless of their musical ear. He explained his invention in Der physikalische und musikalische Tonmesser of 1834. It was used extensively by nineteenth-century acousticians and served as a basis for further innovations, including Rudolph Koenig’s “universal tonometer,” which extended the scale of Scheibler’s apparatus from a single octave to the entire range of the human ear.