Guitar Setup Tools
Measure neck relief and string action separately
Neck relief and string action describe different gaps. Choose a gauge that matches the location, the way the string is held, and the units in your guitar's setup instructions.
Record the string and fret
Follow the procedure for the exact guitar model. For a relief check, the string serves as a reference along the neck when held at the prescribed points. Record which fret and string the maker specifies for reading the gap.
Read action at the specified fret
An action ruler reads string height from the top of a fret to the underside of the string at the prescribed location. Record both outside strings if the setup guide calls for them. The appropriate target depends on the instrument and setup.
Compare the scale before buying
Choose graduations you can read in the manual's units. A set with a feeler gauge and an action ruler can serve both jobs if each tool has a scale and working range that suit the instrument.