--- 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: "VT11535" currency: VUV in_stock: true reviews_count: 4 url: https://www.desertcart.vu/products/182229104-fretguru-metric-8-in-1-string-action-gauge-guitar-fret store_origin: VU region: Vanuatu --- # Diamond Honed Edges CNC Machined Precision Genuine Leather Case 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:** VT11535 **Availability:** ✅ In Stock ## Summary > 🎸 Elevate Your Sound with Precision Craftsmanship! ## 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?** VT11535 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/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 - • **User-Friendly:** Satin black anti-glare coating with bright silver markings for easy reading. - • **Durable Design:** Diamond honed and polished edges ensure no scratches on your frets. - • **Metric Mastery:** Perfect for metric measuring enthusiasts to dial in their guitars. - • **Lifetime Protection:** Comes with a stunning handmade genuine leather case. - • **Precision Engineering:** Crafted with CNC machining for unparalleled accuracy. ## Overview The FretGuruMETRIC+ 8-in-1 String Action Gauge is a professional-grade tool designed for guitarists who demand precision and playability. With its CNC machined, diamond honed edges, and a sleek anti-glare finish, this gauge ensures your guitar is set up perfectly every time. Plus, it comes with a luxurious leather case to protect your investment. ## Description Full description not available ## 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 ## Product Details - **Brand:** FretGuru - **Color:** Metric - **Body Material:** Metal - **Neck Material Type:** Maple - **Fretboard Material Type:** Maple Wood - **Guitar Pickup Configuration:** H-S-H - **String Material Type:** Alloy Steel - **Hand Orientation:** Left - **Guitar Bridge System:** Fixed - **UPC:** 860001682809 ## 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) ## 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worthwhile, convenient tool. *by N***1 on September 6, 2025* Top quality, as represented. Leather case is a nice addition. Good tools last a lifetime (at least one!) and give a sense of satisfaction when in use. This is no exception. Makes everything during setup easier, and provides accurate, repeatable measurements. ### ⭐⭐⭐⭐⭐ A Set-Up tool that works *by M***K on December 23, 2019* This is a set-up tool that is easy to read, understand, and use. If you have any trouble playing a fretted string instrument, this tool is well worth the price. The main problem players have is having to push harder than they should to fret a string. This leads to finger, and hand pain, or frustration that leads to not playing as much as needed to play well. The distance between the frets, and the strings is a big part of making an instrument playable. If it is too high, it makes it harder to play accurately, or for very long. If it is too low, it can make the strings buzz on the frets, making a good instrument sound, and play like a badly made instrument. If you have even a cheap $25 Ukulele that is properly set-up with proper Action Height, it will play, and sound better than a more expensive, but not set-up properly Ukulele. Same goes for any fretted stringed instrument.There are several set-up tool makers, most of them cost less, but the FretGuru gauge is well made with polished edges, so you can slide it along the frets without worrying about marking, or scratching the frets. The measurement markings are very readable, and don't wear off, making this a long lasting tool, even for the professional Luthier, that uses it every day.I am no Luthier, but I have worked on several Ukuleles to set the Action Heights, and all of them play easier, and the feel is much nicer.You may never want to try and set the Action Height yourself, but this tool will let you know where the action is set at, and help you understand what, and how your set-up is, and if you need to take it to a shop that can adjust your action height. ### ⭐⭐⭐⭐⭐ A great tool with few caveats *by S***N on April 4, 2019* Below I’m going to review the product but also shed some light on the creator of this product. The overall score is a reflection of the product itself and not the creator because these are product reviews, not seller reviews, but it’s worth talking about both.About the product itself:This tool is fantastic for everyone from weekend warrior string instrument players to luthiers. Primarily this is a string height measurement tool, everything is kinda plays second fiddle, however, I imagine these secondary gauges will be really useful when the time is right. It’s nice that the creator maximized its usefulness.As far as accuracy is concerned it’s dead-on from what I can tell, I tested with a very high precision caliper.In the past for set up I used this same caliper but I found it annoying because getting precise measurements is an exercise in patience. For maximum accuracy I would use my very expensive caliper to measure the string width, then I would measure from the top of a fret to the top of the string using the depth gauge and then subtract the string width, I would do this three times and then average the results. I didn’t like measuring from the top of the fret to the bottom of the string because it’s hard (for me anyway) to do this precisely. We’re talking thousandths of an inch and it was difficult for me to tell if I was too low or too high using this method. I have also used feeler gauges in the past, but these are very one-dimensional and there was never a feeler gauge that was quite right, so I would stack them together, but I never felt confident.I do like that all markings are laser etched and not printed. I work on bicycles as well and I have some tools with printed markings which have faded over time, I’m confident that this tool will last me a very long period without rubbing or fading.There are only a couple notable (though minor) nitpicks. First, it really is expensive for what it is. You can find very similar tools for less than $10. I’m a big supporter in local economies and I trust that the FretGuru is near 100% accurate, so I went with this tool over saving cash and buying something made in China. In the end I knew what I was buying and paying for, so I can’t knock it down.Second, the tool is very busy with markings. “FretGuru 2” is etched in a large font and and there are five arrows with descriptions etched as well. These arrows/descriptions are only useful once, after which they don’t have any use and only clutter things up. I would prefer a small instruction pamphlet describing each tool because knowing what the gauges are for is easy after learn it the first time. I really like cleanliness and minimalism, but in the grand scheme this is pretty much a non-issue.Finally, I really wish I could choose an option that had markings measured in metric. There is a handy conversion chart on the back, but I would prefer metric markings over flipping it back and forth for conversions, that being said this is another small nitpick.About the creator:It really rubbed me the wrong way when I learned that Bernie basically bribed people for positive reviews. Apparently he offered the leather case if the customer gave a positive review. The product should speak for itself. Thankfully this seems to be an issue from the past because a leather case was included with mine and my tool didn’t come with a piece of paper trying to bribe me into leaving positive feedback. I learned about this issue after ordering and I was prepared to return this item if I received it along with a piece of paper trying to persuade me into leaving a positive review because that goes against my morals. Thankfully this is no longer an issue.Also, Bernie comes across as a bit too impassioned in his responses to low rated reviews. He tends to respond verbosely with heaps of sarcasm when paying customers have complaints. I like his passion for this product, but you have to take these complaints in stride, not yell at your customers telling them that they are wrong. This will only put potential future customers off, had I read these reviews and responses before purchasing this product then I probably would have looked elsewhere.Finally, this product is a bit oversold by Bernie. I get that he is impassioned but he acts like this tool is the second coming. Yes it’s accurate, yes it’s useful, but he treats this as the be-all and end-all of gauges for guitar/bass setup. Yes this tool will help you achieve good results, but so will many other tools. We have been setting up guitars/basses successfully long before this existed, so it’s not as revolutionary as Bernie might lead you to believe. That being said, he is trying to run a business and make money (aren’t we all?) so overselling your product(s) is to be expected, Bernie just goes a bit too far.Conclusion:There are many great features here and it’s a fantastic tool. It’s not perfect in every way possible (what is?) but it will help amateurs and pros alike achieve optimal results. The creator can come across as overbearing, but he is passionate about his product which I suppose is a good thing overall. I do highly recommend this product, especially if you are like myself and want to support local economies, but like everything else in this world it’s not completely without flaws. Thank you Bernie for creating this! I wish you continued success! ## 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 - FretGuru Guitar Fret Crowning File - Dual Sided Dagger 2.0 - MD and LG/XL - Ideal for Frets between .080" to .110" wide - Professional Luthier Tool for Electric, Acoustic and Bass Guitars - iLuiz Guitar Neck Notched Straight Edge Luthiers Tool for Gibson Fender and Most of Guitar Fretboard and Frets --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/182229104-fretguru-metric-8-in-1-string-action-gauge-guitar-fret](https://www.desertcart.vu/products/182229104-fretguru-metric-8-in-1-string-action-gauge-guitar-fret) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-18*