Fret RockerFor musicians and luthiers alike, the Fret Rocker is an indispensable instrument in the toolkit. It addresses the common issue of high frets, whether you're trying to identify them at the start or assess their height post redressing or replacement. This 4 in 1 mini straightedge has a unique design that spans three frets. When placed on the fretboard, it "rocks", which is a telltale sign of uneven fret heights. Precision engineered to an accuracy of .