A very versatile instrument, with the additional course added avoids large stretches on the fretboard when playing melody. Slightly longer scale than the octave mandolin.
24 frets/597mm scale
Width at nut: 42mm
Strings: .010 .018 .032 .042 .058 ~ for tuning DADGD
There is no standard tuning for the Cittern, but these seem to be the favourites:
With suitable string gauges can also tune to open G tuning:
G D B D G