Musical Ruler with Songbook from ThinkGeek
http://www.thinkgeek.com/11a1?cpg=yt
-Become a musician in just a few hours - and measure stuff, too.
-Tuned to the key of C.
-Closed hole, student model.
-Instructional book included (has songs, fingering chart, musical ruler history, etc.)
-Dimensions: approx. 12.3" x 1.6" x 0.19"
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