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Most of the websites i have looked at, say that the frequency of middle C note is approximately 261.626 Hz. and that middle C on guitar is at the 5th string 3rd fret. but my tuner says the frequency at the 5th string 3rd fret is 130.81 Hz.
The 8th note of the C-flat major scale is Cb. Middle C (midi note 60) is shown with an orange line under the 2nd note on the piano diagram. These note names are shown below on the treble clef followed by the bass clef. On the treble clef, Middle C is shown with an orange ledger line below the main 5 staff lines.