No matter how the musical instrument is, no matter what kind of musical instrument, it needs regular maintenance and inspection, so as to ensure that the musical instrument is in a state for a long time. And our guitar string ruler is a very professional guitar measuring tool, and it is your . Features -Color:Black -Material:Stainless steel -Size:10.30X5.20X0.10cm/4.05X2.04X0.04in -Precise scale and professional design provide you with the most professional and first- . -Whether you're a beginner or an experienced guitarist, this guitar fret rocker can help you achieve the perfect sound and playing experience. -The smooth margin design makes it more convenient to measure and will not hurt your musical instruments. -There are different scales on the ruler to meet the measurement needs of different guitar parts. -It's easy to carry, and it won't make you tired if you carry it with you in time. Package list: 1 x Guitar String Action Gauge