Check the frets on the fretboard:

[Cynthia]

The fingerboard is a very important part of the ukulele. On this instrument, all scales are formed by the frets on the fingerboard. In the manufacturing process, it is to inlay the metal frets in the wood. This process requires the pressure of machinery and equipment to make the metal frets firmly inlaid in the wood of the fingerboard. Sometimes it needs to use a hammer or glue hammer wood. Hammer, it is very important to check the quality of the metal fret, because it is closely related to the function of the ukulele.