Got this Stew Mac Nut Slotter Gauge a while back. Have not seen any clones of this device on the net so far. It is the most accurate way to measure string action though. Feeler gauges are great with straightedges like the Stew Mac version although not the Home Depot variant. Do no waste your time with a Home Depot straightedge, they are okay for sheetrock not guitar and bass necks. As far as feeler gauges, they are very difficult because strings are round and they move. The Stew Mac and similar "String Action Gauge" is basically a ruler and as such is not that useful except for realizing fractional readings like 3/32 or 5/64 are not anywhere as accurate as the Stew Mac Nut Slotter gauge.

Neck is my Warmoth Tele style quartersawn roasted maple with Jescar Evo frets. Folks the relief and string height is better than Gibson factory specs...on their guitars!

Side note, if the frets are not level there is no way to get low action. That is why the neck relief, bridges and nuts are so high on production guitars, so the strings don't buzz over bad fretwork.

WARNING: I might be talking in the next video or two. I want to explain the John Coltrane circle of 4ths wheel and the George Russel Lydian Chromatic Concept which IMO Coltrane could have cared less about despite Russel adapting his theory to Coltrane's solos.

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