The T21 Digital Tuner has an auto guide for guitar and violin, plus chromatic tuning and a tone generator.
Three tuning modes, Chromatic Tuning, Guitar Tuning, and Violin Tuning
Tuning Range Db( 69.296Hz- - -d3(1174.66Hz)
The Musedo T21has an automatic Mode and Manual Mode. In the Manual Mode it puts out a precise standard tone. In the Guitar and Violin Mode it has flat, "b" and "bb" functions.