Ibex fret scale ruler

4 scale lengths

- 24 27/32" (631mm)
- 25 11/32" (643.7mm) - commonly used on Martin guitars but called 25.4"
- 25 21/32" (651.7mm)
- 26 1/8" (663.6mm) - a long scale sometimes used on concert classical guitars

Double sided etched stainless steel ruler. One side has the 4 scale lengths with nut and saddle positions, the other side is a standard 700mm ruler in inches and mm.