The fretboard and the tuner only display four strings but the Octave Mandolin (tenor) has eight strings. When tuning, adjust the strings in pairs of adjacent strings, i.e four courses (four pairs).
If you are missing any specific tuning for the Octave Mandolin (tenor), please feel free to send us a suggestion and we will do our best to update our database.
For other mandolin types in the family, see the Mandolin Family.
The tuner is fully chromatic but if you need a reference of a specific tuning when tuning by ear or if you want to tune any other instrument follow the steps in how to setup the guitar tuner for other instruments