https://www.stewmac.es/video-and-ideas/online-resources/neck-building-and-repair-and-setup/metric-string-action-gauge/
Metric String Action Gauge - StewMac
Metric String Action Gauge
string actionmetricgauge
https://support.bluguitar.com/en_US/eguitarwiki/hals-und-saitenlage-einer-gitarre-einstellen
Adjusting the neck and string action of a guitar - BluGuitar
How to perfectly adjust the neck of a guitar and the string action The distance between the strings and the fretboard is a crucial factor in guitar playing
the neckstring actionadjustingguitar