The Hardware

DL Action Finder.

A precision measurement tool for guitar setup. Mount it to your neck and every measurement you need is right in front of you — accurate to 0.0005″, in playing position, string by string.

0.0005″ Accuracy · Patent Pending · 3 years field tested · Made in Franklin, TN

See your adjustments in real time.

The tool stays on the guitar. You keep both hands on the work. The number moves as you adjust.

Turn the truss rod and watch your neck relief settle into place. Raise a saddle and see the string height respond immediately. No remove-measure-adjust-remeasure cycle. No holding a gauge with one hand while trying to turn a wrench with the other.

The number is right in front of you the whole time. This is something no other mounted measurement tool does.

For luthiers & techs

Measurements follow the TRAIN sequence — neck relief first with zero dependencies, string heights with a single dependency, nut slots as a dual-dependency measurement. Your numbers are always in the right order.

In playing position Both hands are free to work

How our setups work

Guitar setups have three sets of measurements.

Neck relief, string heights, and nut slot heights. Get them in the right order and every variable is accounted for by the time you’re done. The card tells you exactly where to measure each one.

Step 1

Neck Relief

One number, measured across the whole neck. Capo at fret 1, press at the calculated fret. This eliminates the nut and strings from the equation entirely. Fix this first.

Capo@1 · Press calculated fret · Zero dependencies

Step 2

String Heights

Six individual measurements at the calculated midpoint fret, string by string. Capo stays at fret 1 to eliminate the nut. Dial across each string and read the gap.

Capo@1 · Calculated midpoint fret · One dependency

Step 3

Nut Slot Heights

Six individual measurements at the first fret, no capo, open strings. Always measured last — this depends on both neck relief and string heights being correct first. Measure, file, retune, remeasure.

No capo · Always fret 1 · Dual dependency

Dial to the string. Press the measurement fret. Zero the gauge. Release. The display shows you the exact gap. Move the dial to the next string. Repeat.

Dial. Read. Adjust. Move to the next string.

0.0005″ IP65 digital gauge · Lightweight stem

The Gauge

0.0005″. Every time.

Resolution alone doesn’t make a measurement accurate. What distorts a reading is everything else — downward pressure from the tool, a neck that bends differently on a bench than in your hands, a gauge you have to hold while you work.

The DL Action Finder removes all of it. It only works in playing position — because a neck on a workbench bends flatter than it does when you’re holding it, and that difference is real. Most luthiers compensate for this. Compensation is a judgment call. A measurement isn’t.

Carbon fiber stem
Light enough that it doesn’t push your strings down. Your strings stay exactly where they are when you play.

Large digital display
The number is right in front of you. No squinting, no reading between lines, no estimating.

Visible contact point
You can see exactly where the gauge tip touches the string before you take the reading. Confidence that you’re measuring the right thing, every time.

Soft-touch buttons
Engineered so pressing a button doesn’t shift the unit. Even a small movement changes the reading.

String to stringOne motion · No resetting

The Dial

String to string in one motion.

The main dial moves the gauge laterally — from string to string across the neck. No lifting the tool, no repositioning, no resetting between strings. One smooth motion covers all six.

Dial to position the gauge over a string, press the measurement fret, zero the gauge, release. The display shows the gap. Move to the next string. On a six-string guitar that’s up to thirteen individual measurements across three sets — the dial is what makes moving through all of them fast.

Most setups take longer than they need to because the tool keeps getting in the way. The dial fixes that.

How It Mounts

Three contact points.
Exact center. Every time.

The DL Action Finder clamps to the sides of the neck with gear-driven arms. Both sides always move in perfect unison — dead center is guaranteed by the mechanism, not by your hand.

Gear-driven arms
The clamp arms are gear-driven, and move in unison to keep the unit centered.

Cork pads
Lacquer-safe cork. Secure grip without marking vintage or custom finishes.

Centerbar
Sits between strings 3 and 4 on your guitar — strings 2 and 3 on bass. Lifts the tool body clear of the strings so only the gauge tip makes contact.

Four centerbars included.

Different heights for different string action ranges — from low-action electric to bass. The centerbar position is also why the DL Action Finder is built for 6-string guitars and 4-string fretted basses. On a 7-string or 5-string bass, the centerbar would land on a string instead of between them.

Compatible Instruments

Works on
your guitar.

All 6-string electric guitars
All 6-string steel-string acoustic guitars
All 4-string fretted basses
Every scale length

Not compatible with: 7-string guitars, 5-string basses, nylon-string or classical guitars, fretless instruments, or upright basses. The Centerbar geometry requires six strings on guitar and four strings on bass.

The Software — Included Free

The tool gives you the number.

The DL Setup Engines give it a home. Once you have your measurements, the engines help you define your setup, translate it to other guitars, and calculate your full string radius. Everything saves to your Vault.

The tool and the engines were built together. Neither one is complete without the other.

See how the Setup Engines work →