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Amazon.com: StewMac String Action Gauge And Ruler, Metric, Stainless Steel - Designed by StewMac, The Original measuring tool for acoustic and electric guitar, and bass setup : Musical Instruments
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Baroque String Instruments Gauge String Action Gauge Ruler Pocket-size Metallic Ruler for Electric Bass and Acoustic Guitar String Height & Fret Crown Height Measurement - Walmart.com
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