Co link String Action Ruler Gauge Tool Guitar for Electric Bass Acoustic Mandolin Banjo

Useful conversions, long lasting etched printing. Pocket-sized, a lot of info on a tool of this size With conversion chart of string action at 12th fret printed on one side With scale to measure string height, bridge saddle height, saddle slot depth, pickup polepiece height, fret slot depth and nut height Perfect accurate action measurements for string instruments such as guitar, bass, mandolin, banjo, etc. Note: this gauge with a layer of plastic film covered outside.