Original string action gauge - inches

This pocket-size stainless steel rule is ideal for accurate setup adjustments on any stringed instrument. Developed by Dan Erlewine and Don MacRostie at Stewart-MacDonald, the gauge features a progressive string height scale: simply slide it across the frets and read the measurement under the string. It's faster to use than any ruler, and stays parallel to the fingerboard - much easier than trying to hold a ruler perpendicular to a rounded fret.

The string height markers are graduated from .010" to .140".

The back of the gauge has a time-saving fractional/decimal/metric conversion chart.

As well as setting/checking string height, you can use it to measure:

- Bridge saddle height

- Saddle slot depth

- Fret slot depth (unbound fingerboards)

- Nut height

- Pickup polepiece height

You can also use it to set up router cutters accurately.