Revolutionary 3-in-1 Straightedge Tool

The Music Nomad MN820 Tri-Beam sets a new standard in precision fret and fingerboard diagnostics. This patent-pending 3-in-1 straightedge features an innovative triangular design that includes three essential lengths: 17.6″ (44.7cm), 12″ (30.5cm), and 6.5″ (16.5cm)—all in one ultra-durable tool. Unlike traditional flat rulers, this tri-wall construction provides superior rigidity, making it flex-free and easy to grip during detailed work on any string instrument. Whether you’re a luthier, tech, or DIY guitarist, this tool is designed to simplify setup and inspection with unmatched stability and control.

Built for Accuracy and Playability

Accurately diagnosing fret and fingerboard issues is critical for optimal playability. The Tri-Beam’s precision-ground and lapped edges are accurate to +/–.00125” per foot, helping you identify global or localized issues up and down the neck. Whether you’re checking for high frets, warping, or inconsistencies in the fretboard, the MN820 ensures flawless flatness and dependable alignment. The three sizes allow for flexible diagnostics, from full neck analysis to pinpointing trouble spots near the nut or bridge.

Integrated Ruler and Scale Length Reference

Beyond being a precision straightedge, the MN820 includes SAE and metric ruler markings for quick measurements during setup. Even better, it’s equipped with 13 of the most common guitar and bass fret scale lengths, including popular standards like 24.75”, 25.5”, 34”, and more. This makes it easy to verify instrument scale length and check approximate bridge placement from the 12th fret in seconds. It’s also a great way to determine the correct Music Nomad Fret Shield size for your instrument.

Features

Our patent pending 3 ‘n 1 precision straightedge sets a new higher standard. Its unique triangle 3 wall design is easy to hold, flex-free and includes the critical straightedge sizes of 17.6″ (44.7cm), 12″ (30.5cm) and 6.5″ (16.5cm) in one Tri-Beam tool. No other product has 3 Straight edges in 1.
Specifically designed for Luthiers and DIY’ers, it helps check if the frets and fingerboard are level when diagnosing playability issues.
Includes SAE and Metric rulers for quick measurements, plus 13 of the most popular guitar and bass fret scale lengths so you can quickly check the scale of any guitar or bass on your bench. Additionally, from the 12th fret, you can quickly check the approximate bridge placement using the fret scale length ruler. The scale length ruler also helps determine which MusicNomad Fret Shield (sold separately) to buy.
Designed by our Sonoma, CA (USA) team, the premium quality 6063-T5 Aluminum has a blue anodized finish that is extremely durable, abrasion resistant and does not peel or chip. Imprecision is eliminated through single setup, continuous 5-axis CNC producing flawless features on all surfaces of our innovative profile. Convenient hang hole included.
All 3 straightedges are precision ground and lapped to ensure smooth flat edges within an accuracy tolerance of +/-.00125″/ft.