Features: 1.The double-sided gauge ruler includes a conversion chart of string action at the 12th fret an accurate scale to measure string height, bridge saddle height. 2.Also can measure saddle slot depth, fret slot depth and nut height and accurately measure other setup adjustments. 3.There is fraction, decimal, metric conversion chart on back. 4.This string action gauge makes measuring faster and more accurately. 5.This gauge is made of qualified plastic, durable to use. Great measuring tools for guitar. specification: The double-sided gauge ruler includes a conversion chart of string action at the 12th fret an accurate scale to measure string height, bridge saddle height. Also can measure saddle slot depth, fret slot depth and nut height and accurately measure other setup adjustments. There is fraction, decimal, metric conversion chart on back. This string action gauge makes measuring faster and more accurately. This gauge is made of qualified plastic, durable to use. Great measuring tools for guitar. s: Condition: 100% Brand New and High Quality Material: Plastic Color: White Size: Approx. 8.5 x 5.4cm / 3.3 x 2.1inch Quantity: 2Pcs Weight: Approx. 12g Package Included: 2 x Guitar String Action Gauge