---
product_id: 182229104
title: "FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case"
brand: "fretguru"
price: "$62.62"
currency: USD
in_stock: true
category: "Fret Guru"
url: https://www.desertcart.us/products/182229104-fretguru-metric-8-in-1-string-action-gauge-guitar-fret
store_origin: US
region: United States of America
---

# Handmade genuine leather case 8-in-1 precision gauge CNC machined stainless steel FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case

**Brand:** fretguru
**Price:** $62.62
**Availability:** ✅ In Stock

## Summary

> 🎸 Dial in your dream tone with precision and style!

## Quick Answers

- **What is this?** FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case by fretguru
- **How much does it cost?** $62.62 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/182229104-fretguru-metric-8-in-1-string-action-gauge-guitar-fret)

## Best For

- fretguru enthusiasts

## Why This Product

- Trusted fretguru brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Metric Mastery:** Deeply etched, anti-glare metric markings for ultra-clear, professional-grade accuracy every time.
- • **Trusted by Pros:** Top-rated (#26 in Guitar Tools) with 4.8 stars from 399 reviews—join the elite luthier community dialing in perfect playability.
- • **Precision Perfected:** CNC machined and diamond honed edges ensure zero fret scratches and flawless measurements.
- • **All-in-One Efficiency:** 8-in-1 multi-tool design streamlines your setup, saving time and maximizing guitar tone.
- • **Durability Meets Style:** Surgical stainless steel base with satin black finish paired with a luxurious leather case for lifetime protection.

## Overview

The FretGuru METRIC+ is a professional-grade, 8-in-1 guitar string action gauge crafted from CNC machined stainless steel with diamond-honed, polished edges. Designed specifically for metric measurements, it features deeply etched anti-glare markings and comes with a handmade genuine leather case. This tool is engineered to protect your frets while delivering precise setup adjustments, making it a favorite among serious guitarists and luthiers.

## Description

Buy FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case: Tools - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## Features

- The FretGuru 2 is a PRECISION, PROFESSIONAL GRADE TOOL, PURPOSE BUILT for WITH ONE GOAL - to help you SQUEEZE EVERY LAST DROP of TONE and PLAYABILITY from YOUR GUITAR. EVERY other "ACTION GAUGE" that you see is JUST A re-purposed METAL BUSINESS CARD, not a precision tool
- NOW all our METRIC MEASURING friends can get YOUR GUITARS completely dialed in and playing sweet
- NO SCRATCHES on YOUR FRETS with the FretGuru 2's PRECISION CNC MACHINED, DIAMOND HONED AND POLISHED EDGES
- EASY ON THE EYES satin black ANTI-GLARE coating, with BRIGHT SILVER markings DEEPLY ETCHED directly INTO THE surgical STAINLESS STEEL BASE METAL
- FREE BONUS - PROTECT YOUR INVESTMENT and help it LAST A LIFETIME with the GORGEOUS HANDMADE GENUINE LEATHER CASE

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07YK61YM6 |
| Back Material Type | Metal |
| Best Sellers Rank | #1,831 in Musical Instruments ( See Top 100 in Musical Instruments ) #26 in Guitar Tools |
| Body Material | Metal |
| Body Material Type | Metal |
| Brand | FretGuru |
| Brand Name | FretGuru |
| Color | Metric |
| Customer Reviews | 4.8 out of 5 stars 399 Reviews |
| Fretboard Material Type | Maple Wood |
| Guitar Bridge System | Fixed |
| Guitar Pickup Configuration | H-S-H |
| Hand Orientation | Left |
| Included Components | Leather Case |
| Instrument | guitar |
| Manufacturer | FretGuru |
| Material Type | Metal |
| Model Name | METRIC+ |
| Neck Material Type | Maple |
| String Material Type | Alloy Steel |
| Top Material Type | Stainless Steel |
| UPC | 860001682809 |
| Warranty Description | Na. |

## Product Details

- **Back Material Type:** Metal
- **Body Material:** Metal
- **Brand:** FretGuru
- **Color:** Metric
- **Fretboard Material Type:** Maple Wood
- **Guitar Pickup Configuration:** H-S-H
- **Hand Orientation:** Left
- **Neck Material Type:** Maple
- **String Material Type:** Alloy Steel
- **Top Material Type:** Stainless Steel

## Images

![FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case - Image 1](https://m.media-amazon.com/images/I/81VZcmZv8sL.jpg)
![FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case - Image 2](https://m.media-amazon.com/images/I/81rPHTTVFBL.jpg)
![FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case - Image 3](https://m.media-amazon.com/images/I/81LjDN+6b-L.jpg)
![FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case - Image 4](https://m.media-amazon.com/images/I/81Ed4G9SgML.jpg)
![FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case - Image 5](https://m.media-amazon.com/images/I/81EOD8Sx6fL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: How should I use this to measure whether or not the nut slot needs filing? Thanks.**
A: Yes.

The general idea of the Nut Slot Height feature is to be able to project a perfectly straight line from the bottom of the nut slot, directly to the top of the second fret - ideally leaving a slight gap above the 1st fret as the gauge passes over the 1st fret. 

The purpose of the "thin corner" on the Nut Slot Height feature, is to allow the gauge to (hopefully) slip all the way down to the bottom of the narrowest slot (high e string) to give an accurate reading.  

For every string, there's an ideal height for each nut slot - that's slightly higher than if there was just another fret where the nut is now.

Not a ton of difference - Actually less than the thickness of a thin sheet of paper on the high e string.

If the nut slots are even a few thousandths (.001") too low, you'll be forced to compensate by adding more relief (i.e. loosening the truss rod), or raising the saddle(s)

Starting with the low E string, place the gauge corner into the low E slot, then the other end of the gauge across to the 2nd fret.

Now look at the gap between the bottom edge of the gauge and the 1st fret.  You should be seeing some daylight.

How much?  I'll give you some target numbers that are if anything just slightly high - and depending upon your particular guitar, you can work each slot down the next few thousandths through testing with strings on.

You can use feeler gauges when measuring between the gauge and the 1st fret, or even various thicknesses of paper. I've used both with equally good results.

Between a regular sheet of cheap/thin copy paper (.0035") and a standard mailing envelope (the kind that bills come in - .005")...  there's few combinations you can't create by either double-folding a strip, or combining one of each. These combinations coincide pretty closely with the low E to high e measurements.

High e setting is generally not more than .003".  When using paper, that's a snug fit - you'll feel some drag when pulling the paper between the fret and the gauge.

Low E setting is (almost) never more than .009" (typically .006” - .008").  

Every other string is spread fairly incrementally between those points.  

Below I'll give each string and the typical range of measurement:
String:

- E - .006” - .009"
- A - .006" - .008"
- D - .005" - .006"
- G - .004" - .006"
- B - .003" - .005"
- e - .0025" - .0035"

The only (slight) variation tends to be the unwound G on an electric...  often you'll leave it as high as the D string. As low as possible without buzzing n the open position is the goal, so notes don't pull sharp in the first few frets.

So, how do you know when you’ve REALLY got this dialed in?

When you feel like you’ve got the action and relief about as good as you can adjust it...

What you should shoot for (at least what I look for) is to make every open string note just slightly harder to make buzz than it is on the lowest fretted notes. Often giving a very slight allowance on the open E string if you really like to dig in for a big E chord.

## Frequently Bought Together

- FretGuru METRIC+ 8-in-1 String Action Gauge Guitar Fret Ruler Precision Fret Rocker - Precise CNC Machined, Diamond Honed, Polished Edge Guitar String Height Gauge - Luthier Tool with Leather Case
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-09*