No matter how delicate the musical instrument is, no matter what kind of musical instrument, it needs regular maintenance and inspection, so as to ensuring that the musical instrument is in a good state for a longtime. Features -Color:Black -Material:Stainless steel -Size:10.30X5.20X0.30cm/4.05X2.04X0.12in -It can help you measure the level and vertical distance of each part of the guitar and whether the height is consistent. -The smooth edges can help you measure accurately, and it's very easy to use. -The scale on the ruler is clear and clear, and will not fade even after longtime use. -The compact size keeps it out of the way no matter where they are placed, but is very easy to store. -The operation method is very simple and can be learned quickly, even for the first practical use. Package list: 1 x string height ruler