True Temperament works very well with acoustic guitars; steelstringed as well as nylonstringed. Correcting intonation on an acoustic guitar is, as you know, very limited. If you want to assure yourself of an acoustic guitar that provides close to perfect intonation for every note across the fretboard you should go for the TT system.   We offer the Thidell Formula 1 temperament for both steel-string (wound G) and nylon-string guitars with 650 mm and 630 mm scale length.