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"Now here’s a trusty friend all musicians and technicians need in order to keep strings at the right height. I have been using a six inch ruler exactly like this since 1971 and it always tells the truth! I keep my guitars in good set-up all the time. Measure from the top of the fret to the bottom of the string at the first fret and at the 12th fret." René Martinez
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🇺🇸 Ship from USA · On Agora since 2026
$7.95