ENO is a relatively new product within Europe and essentially follows on from the Intelli-touch range of clip-on chromatic tuners. The ENO ET 3000/3100 attaches to the guitar headstock and detects the pitch of the strings not only from the frequency of the resonation, but also from the vibrations that reverberate through the wooden body of the guitar. Once the string is at perfect pitch the LCD display on the tuner glows green. ENO provide this technology for the entry-level segment of the market via the square 3100 or triangular 3000 clip-on models.