Feature:1. ACCURATE MEASUREMENT: Come with accurate scale for measuring the height of wire ropes and bridge saddles2. MULTI FUNCTION: Also measures saddle groove depth, fretting groove and nut height, and accurately measures other settings and adjustments3. FAST AND CONVENIENT: String action gauge ruler make measurement faster and more accurate, very practical and convenient4. DURABLE PLASTIC MATERIAL: This guitar string height gauge is made of excellent plastic material and durable5. WIDE APPLICATION: This is a great guitar measuring tool for luthier, also suitable for bass, mandolin, banjo, ukulele, etc.Specification:Item Type: String Action Gauge RulerMaterial: Plastic Package List:1 x String Action Gauge Ruler