4mm, allowing for the fine-tuning required by discerning musicians. Achieve professional-level playability with this high-quality stainless steel string action ruler. Professional String Action Ruler – Stainless Steel Precision Guitar Setup Gauge.
Alnicov Stainless Steel String Action Ruler Guitar Setup Gauge Luthier Silver
Alnicov Stainless Steel String Action Ruler Guitar Setup Gauge Luthier Measurin
Guitar String Action Ruler. Ruler to measure several string/guitars settings
