Get our two most popular Precision Gauges in this combo pack. Measuring your neck relief and string action height are the two most common tasks performed to improve your guitar or bass playability and sound. First step is to use MusicNomad's Precision Truss Rod Gauge that comes equipped with the 3 most common relief measurements (.006”, .008”, .010”). Instructions printed right on the handle makes it extremely easy to dial in your neck relief. Second step is MusicNomad’s Precision String Action Gauge that comes with accurate measurements that are easy to read with the black finish contrasted with deep etched white markings. We include measurements in inches, metric & 64ths to customize to your preference. Our convenient chart on proper height by instrument type takes out the guesswork. Both gauges are designed for all Electric, Acoustic, Classical and Bass Guitars. So these two gauges will measure all your instruments but you will need to get our tools (sold separately) to make the proper adjustments. That's MusicNomad quality – raising the bar in equipment care.