String projection over individual frets is an essential parameter of the instrument set-up.
String Projection Gauges
The gauge is designed to measure the projection of the string (gap between the bottom of the string and the fingerboard surface or fret top).
The use is simple, in two steps:
1. Placing the gauge over the string in desired position, letting the gauge finger to tap the string and reset the digital indicator to zero.
2. Pressing the string towards the fingerboard or fret with the gauge finger