Guitar Setup Tools
Choose a fret rocker or straightedge
Pick the surface and span you need to check. A local rocking check and a neck-length reading answer different questions.
Check a local group of frets
A fret rocker bridges a small group of frets. Choose an edge that fits the spacing in that area of the neck. If it rocks, check the local contact points and neighboring positions before concluding which fret is responsible.
Read a longer surface with a straightedge
A plain straightedge references the surfaces it touches across a longer span. A notched edge leaves room for the frets and touches the board between them. Choose the reference surface for the check you want to make.
Match the fret spacing of the notches
The spacing on a notched edge has to align with the frets on your instrument. Read the supported scale lengths and compare the exact guitar. A broad compatibility claim does not replace the stated measurements.