Baroque Stringed Instrument Action Ruler Gauge Luthier Measuring Tool for Electric Acoustic Guitar Bass Ukulele Mandolin Banjo SAR10

Specifications: Material: high quality stainless steel of strong hardness Unit: mm / in Scale for string height: 0.01-0.14in / 0.25-3.50mm Scale for bridge saddle slot depth: 0-0.875in / 0-20mm Scale for nuts saddles and polepieces: 0-0.75in / 0-20mm Ruler size: 8.9 * 5.1cm / 3.5 * 2in (length * width) Color: As the pictures show you Ruler weight: 22g / 0.78oz Application: Perfect accurate action measurements for string instruments such as guitar, bass, Ukulele, mandolin, banjo, etc. Package including: 1 * String Action Ruler ?there is simple use instruction on package?