There's nothing worse than starting to install frets and finding that the slot isn't deep enough. Almost as bad is cutting unnecessarily deeply to "be on the safe side", and then having to fill in the ends of each fret slot.

This handy little gauge allows you to compare the wire to the slot quickly and reliably. Simply hold the flat edge against the fret tang, note the height of the tang against the reference lines, fit the appropriate curved edge into the slot, and compare the lines again.

The gauge is machined from .018" (.46mm) stainless steel for durability in the repair shop, and it fits into any fret slot. It's a big help for refret jobs (it fits bound fingerboards), for setting the depth stop on adjustable fret slotting saws, and for setting the cutting height of fret slotting table saw blades.

The non-glare etched surface is easy to read, and the curved edges fit all popular radiused and flat fretboards.