"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."
Stainless steel 6'' ruler. Measures 64ths and 32nds of an inch. Essential for setting up guitars. Pocket clip/slide also included (not pictured).