As easy to use, even for beginners very suitable.
+ Solid and high-quality processing
+ Fully suitable for operation Stage
+ Large and easy to read display
+ Large detection area, therefore also suitable for 7-string 'E's and 6-string bass
+ First-class tuning of the strings
+ Built-in microphone for tuning of Accoustic Guitar very precise
+ For its purpose handy dimensions
+ Can also be placed through slot on the back of card / plectrum
For the technically minded here the specifications:
(I was asked Amazon to remove them)