String action gauge

This pocket-size stainless steel rule is ideal for accurate setup adjustments on any stringed instrument. 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.

Although various gauges like this are available on the internet, this original US version designed by Dan Erlewine and Don MacRostie at Stewart-MacDonald remains the best quality - heavy duty stainless steel, clear and accurate markings. Good for a lifetime!

The string height markers are graduated from 0.25mm to 3.50mm on the metric version

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.