The D'Addario String Height Gauge is an all-in-one tool that helps you set up your guitar with the highest possible level of precision. Made from stainless steel, this durable tool makes it easy to measure the height of your strings and pickups, along with neck relief and other critical measurements. With access to all these measurements in one place, getting a guitar into its best playing form is far simpler. It is ideal for players and technicians who want an accurate, repeatable way to check and fine-tune a guitar's setup, marked in both US and metric sizes for easy reference. Features Stainless steel construction offers precise, long-lasting accuracy for guitar setup work. Measures string height at any fret for quick, repeatable action checks. Also measures pickup height, helping dial in balanced output across the strings. Assesses neck relief, giving a complete picture of a guitar's playability in one tool. Marked in both US and metric sizes for easy use alongside any other measurements or references. Specs Material: Stainless steel Measures: String height, pickup height, neck relief Sizing: US and metric Use: Guitar setup and maintenance