Double-sided measuring ruler with a conversion table for the 12th fret top string. It enables precise measurement of saddle height, string height, saddle notch height, fret groove height, and nut height. Portable and lightweight: small size and light design make it easy to carry. You can measure your strings accurately anytime, anywhere. Comprehensive measurement: double-sided with conversion tables on the back for fractions, decimals, and other units. Designed for convenience and ease of use. Fast and accurate: enables quicker, more precise measurements, saving time and tools. Helps you make precise adjustments for optimal performance. Use scenarios: - After string changes or setup work, to verify saddle height, string height, and nut height for proper action. - During routine maintenance or fretwork, to check fret groove height and overall string clearance. - On stage or while traveling, to quickly confirm measurements and ensure consistent setup before playing.