The Blues Scale is very similar to the minor pentatonic scale. There’s only one new note: the flattened fifth (also known as the devil’s interval).
C Blues Scale
The extra note fits in to the minor pentatonic like this:
Looks like this in tab:
And sounds like this:
Here’s me having a little mess around with it.
D Blues Scale
Like the minor pentatonic, you can change the key of the blues scale just by moving the same pattern up the fretboard. The lowest note on the scale is the key that it’s in. For example, the D blues scale starts on the second fret of the C string like this:
And this in tab:
F Blues Scale
The same deal with F. Starting on the fifth fret of the C string.
If you want tab for the ‘blues mess around’ – and plenty of other ukulele blues – check out my How to Play Blues Ukulele ebook.