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Updated: 06 Apr 2026

10 Best Radius Gauges

#1 Best Pick
Radius Cone Gauge, Stainless Steel, Internal concave Convex Measuring Tool (R52-100 mm)

Radius Cone Gauge, Stainless Steel, Internal concave Convex Measuring Tool (R52-100 mm)

Brand: Hilitand
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  • This bar is made of stainless steel, the radius gauge is durable and rustproof.
  • This radius gauge has two types of blades, allowing both convex and concave surfaces to be tested.
  • Each sheet of the radius measuring tool is clearly marked to determine which blade you need.
  • There are radium gauges with different measuring ranges that you can choose to measure the radius of an object.
  • Very useful teaching for tool and mould makers, machinists and many other workers to check the radius of tools.
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#2 Best Value
Guitar String Height Gauge,Guitar Ruler Tool | Radius String Action Ruler Feeler Gauge for Bass Setup Luthier Tools Set

Guitar String Height Gauge,Guitar Ruler Tool | Radius String Action Ruler Feeler Gauge for Bass Setup Luthier Tools Set

Brand: Generic
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  • Wide Range of Uses: Effectively gauge millimeters and inches for any guitar type, offering dependable accuracy and convenience for a variety of models
  • Excellent Material: Stainless steel material of Guitar Radius Gauge Set withstands wear and tear, ensuring longevity with its rust-resistant properties for lasting precision
  • Easy Readability: Offering precise measurement with clear surfaces and an easily identifiable scale, this guitar radius gauge ensures accurate results every time
  • Multiple Purposes: The versatile gauge accurately measures string height, bridge height, saddle groove depth, and handle groove depth, optimizing musician setup
  • Various Tool Combinations: Various tool combinations ensure detailed guitar setups, featuring an arc ruler, T-shaped ruler, string height ruler, gap ruler, and more, for optimal playability
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#3 Budget Pick
17 Pcs Guitar Luthier Tools Set, Guitar Radius Gauge, Feeler Gauge, String Action Ruler Gauge, Guitar Neck Notched Straight Edge, Guitar Notched Radius Gauges, Fret Rocker for Electric Guitar Setup

17 Pcs Guitar Luthier Tools Set, Guitar Radius Gauge, Feeler Gauge, String Action Ruler Gauge, Guitar Neck Notched Straight Edge, Guitar Notched Radius Gauges, Fret Rocker for Electric Guitar Setup

Brand: JIRONN
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  • High-quality materials: The full set of measuring tools for guitars is made of high-quality stainless steel and plastic, which is rust-resistant and corrosion-resistant, durable, and has rounded edges that will not hurt your hands.
  • 6 kinds of Guitar Repair Tools: The complete guitar measuring kit includes 1 string action ruler, 1 feeler gauge, 9 guitar radius gauges, 1 guitar neck groove straight edge, 1 leveling tool, and 4 notched radius gauges, for a total of 17 guitar gauges, enough to meet the needs of luthiers.
  • Guitar Radius Gauge Size: The guitar Radius gauge tool comes in 9 sizes: 7.25 inches, 9.5 inches, 10 inches, 12 inches, 14 inches, 15 inches, 16 inches, 17 inches, 20 inches.
  • Slotted Radius Gauge: Equipped with 2 narrow radius gauges and 2 wide radius gauges, the guitar grooving radius gauge tool is not only parallel to the fretboard, but also can quickly and accurately find the curvature of the fretboard or bridge without removing the strings, making it a practical accessory for guitarists.
  • Wide range of use: A full set of guitars measuring tools is suitable for measuring all kinds of electric guitars, electric basses, electric box guitars, acoustic guitars, folk guitars, etc.
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#4 Top Choice
Guitar Fretboard Radius Gauge 7.25in 9.5in 10in 12in Precision Measuring Tool for Musicians

Guitar Fretboard Radius Gauge 7.25in 9.5in 10in 12in Precision Measuring Tool for Musicians

Brand: Generic
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  • [Precise Measurements] This guitar radius gauge tool features 7.25in, 9.5in, 10in, 12in sides for accurate fingerboard radius measurements on various guitars.
  • [Versatile Compatibility] Compatible with a variety of string instruments such as guitars, basses, banjos, and more.
  • [Quick & Accurate] Easily identify the curvature of fingerboards or saddle nuts with this precision measuring tool.
  • [ Construction] Made from sturdy stainless steel, this gauge ensures long-lasting use for musicians.
  • [Portable & Convenient] Compact design allows for easy transportation to gigs, rehearsals, and tuning sessions.
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#5 Popular Choice
Swpeet 6Pcs 5 Sizes R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25/ R26-80 Stainless Steel Radius Gauge with Feeler Gauge Kit, 5 Sizes Metric and Imperial Arc Fillet Concave Convex Gap Measuring Tool

Swpeet 6Pcs 5 Sizes R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25/ R26-80 Stainless Steel Radius Gauge with Feeler Gauge Kit, 5 Sizes Metric and Imperial Arc Fillet Concave Convex Gap Measuring Tool

Brand: Swpeet
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  • 🏅【 Radius Gauge with Gap Feeler Set 】:You will get 5Pcs stainless steel radius gauge with 1Pcs gap feeler, including R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25/ R26-80/ 89A32. These Radius Gauge can meet all your various need.
  • 🏅【 Stainless Steel Radius Gauge 】: Radius gauge are made of high quality durable stainless steel, heat processed with chrome finish, which is high hardness and not easy to deform.
  • 🏅【 Feeler Gauge Sizes 】:Metric sizes (mm): 0.04, 0.05, 0.06, 0.08, 0.10, 0.13, 0.15, 0.18, 0.20, 0.23, 0.25, 0.25, 0.28, 0.30, 0.33, 0.35, 0.38, 0.40, 0.43, 0.45, 0.48, 0.50, 0.53, 0.55, 0.58, 0.60, 0.63, 0.65, 0.70, 0.75, 0.80, 0.88. Inch sizes: 0.0015, 0.002, 0.0025, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.010, 0.010, 0.011, 0.012, 0.013, 0.014, 0.015, 0.016, 0.017, 0.018, 0.019, 0.020, 0.021, 0.022, 0.023, 0.024, 0.025, 0.026, 0.028, 0.030, 0.032, 0.035.
  • 🏅【 Clearly Marked 】:The radius measuring instrument comes in two types of blades, each blades are clearly marked for easy identification. Besides, the 360-degree locking screw design allows you to unfold or fold it easily. The gap feeler adopt dual marked metric and imperial 0.0015 - 0.035in / 0.04mm - 0.88mm.
  • 🏅【 Wide Applications 】:There are 5Pcs radius gauge in different shapes and 1Pcs gap feeler to meet you various need. Useful for tool and mold manufacturers, mechanics and many other workers to check the tool radius of the meter, measure the thickness or width of screw, valve, bearing ect.
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#6 Top Pick
lesolar 17 Pcs Guitar Luthier Tools Set Guitar Radius Gauge,String Action Ruler Gauge,Feeler Gauge,Guitar Notched Radius Gauges,Guitar Neck Notched Straight Edge,Fret Rocker for Electric Guitar Setup

lesolar 17 Pcs Guitar Luthier Tools Set Guitar Radius Gauge,String Action Ruler Gauge,Feeler Gauge,Guitar Notched Radius Gauges,Guitar Neck Notched Straight Edge,Fret Rocker for Electric Guitar Setup

Brand: lesolar
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  • 【Premium Material】This guitar gauge set is made of quality stainless steel with rounded off edge, rustproof and corrosion-resistant, won't scratch or hurt your hands, durable for long-term use.
  • 【Understring Radius Gauge】Guitar luthier tools set comes in 9 sizes: 7.25 inch, 9.5 inch, 10 inch, 12 inch, 14 inch, 15 inch, 16 inch, 17 inch, 20 inch.
  • 【4 Notched Radius Gauge】Guitar luthier tools set comes with 2 narrow radius gauges and 2 wide radius gauges in 7.25 inch, 9.5 inch, 10 inch, 12 inch, 14 inch, 15 inch, 16 inch, 17 inch 20 inch radius, which not only stay parallel to the fingerboard, but also quickly and accurately find the curvature of a fingerboard or bridge without taking the strings off, practical accessories for guitar players.
  • 【6 Kinds Tools for Maintenance】The package of guitar radius gauge contains 1 piece string height gauge, 1 piece imperial gap measuring tool, 9 pieces guitar radius gauges, 1 piece guitar neck notched straight edge luthier tool, 1 piece fret rocker and 4 notched radius gauge, 17 pieces in total, easy to cater users' needs.
  • 【Guitar Neck Notched Straight Ruler】Size: approx. 16.5 x 1.45 x 0.13 inch; Weight: 230 g; Dual scale design makes it work well with most guitars, specially suitable for 24.75 inch and 25.5 inch electric guitars.
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#7 Top Pick
Stainless Steel Radius Gauge ToolConcave Convex Fillet Measuring R1 6 5mm for Machinists Toolmakers Work

Stainless Steel Radius Gauge ToolConcave Convex Fillet Measuring R1 6 5mm for Machinists Toolmakers Work

Brand: ZDETGU
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  • Stainless Steel Construction: Made from stainless steel this radius gauge offers lasting performance for precise measurements in various working conditions
  • Measuring Tool: Designed with both convex and concave leaves this fillet gauge ensures accurate radius checks on different curved surfaces
  • Clear Leaf Markings: Each leaf is labeled for quick identification saving time and reducing errors during your measuring tasks
  • Multiple Size Options: Available in R1 6 5mm ranges this radius measuring tool fits diverse project needs from small parts to larger curves
  • Essential : A must have for machinists toolmakers and engineers to verify tool radii with efficiency and reliability
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#8 Top Pick
Radius Gauge Set,Akozon 4 Pieces Stainless Steel Radius Fillet,Measuring Tool Set for R0.3 1.5, R1 6.5, R7 14.5 and R15 25

Radius Gauge Set,Akozon 4 Pieces Stainless Steel Radius Fillet,Measuring Tool Set for R0.3 1.5, R1 6.5, R7 14.5 and R15 25

Brand: Akozon
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  • 【Precision Radius Measurement Tool】The Radius Gauge Set is designed for accurately measuring internal and external radii on tools, workpieces, and mechanical parts. This radius measuring gauge set is an essential measuring tool for machinists and engineers.
  • 【Convex and Concave Blade Design】The Radius Gauge Set includes two types of blades that allow you to check both convex and concave surfaces. This fillet radius gauge set helps ensure precise fitting and accurate machining results.
  • 【Clear Markings for Easy Identification】Each blade in the Radius Gauge Set is clearly marked with measurement sizes, allowing users to quickly identify the required gauge. This machinist radius gauge tool improves efficiency during measurement tasks.
  • 【Multiple Sizes for Versatile Use】The Radius Gauge Set includes multiple gauges in different shapes and sizes, providing flexibility for various measurement needs. This radius measuring tool set is suitable for different machining and inspection applications.
  • 【Durable Stainless Steel Construction】Made from high-quality rust-resistant stainless steel, the Radius Gauge Set offers excellent durability and long service life. This precision radius measuring gauge is resistant to corrosion and wear.
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#9 Top Pick
Guitar Tool Kit Guitar Radius Gauge Set Concave Gauge, Fillet Gauge, Guitar Repair Kit Radius Gauge, Radius Gauge Set Radius Gauges for Machinists for Tool Makers

Guitar Tool Kit Guitar Radius Gauge Set Concave Gauge, Fillet Gauge, Guitar Repair Kit Radius Gauge, Radius Gauge Set Radius Gauges for Machinists for Tool Makers

Brand: Sutinna
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  • PREMIUM MATERIAL: Made of stainless steel, this radius is and resistant to . All the radius are made of steel, heat processed with chrome finish, high strength, good resilience, elegant appearance.
  • MULTI-PURPOSE: The radius measuring instrument has two types of leaves so it can check both convex and concave surfaces. The convex pattern is used to detect the concave arc, and the concave template is used to detect the convex arc.
  • EXCELLENT DESIGN: The 360-degree Locking Screw design allows you to unfold or fold it easily. Each leaf is clearly marked, convenient to identify which leaf you need.
  • WHAT YOU GET: There are four radius gauges in different shapes and sizes to meet you various need. Measuring Range: R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25.
  • WIDE APPLICATION: This radius is widely used in home improvement, machine installation, electric equipment, very useful for tool & die makers, machinists, and many other worker to check the radius of tools.
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#10 Top Pick
ECSiNG 4 Pack Stainless Steel Radius Gauge Set Concave Convex for Tool Die Makers Check

ECSiNG 4 Pack Stainless Steel Radius Gauge Set Concave Convex for Tool Die Makers Check

Brand: ECSiNG
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  • [Measuring Range Detail] : R0.3-1.5mm is 0.3/ 0.4/ 0.5/ 0.6/ 0.7/ 0.8/ 0.9/ 1.0/ 1.1/ 1.2/ 1.3/ 1.4/ 1.5; R1-6.5mm is 1/ 1.25/ 1.5/ 1.75/ 2/ 2.25/ 2.5/ 2.75/ 3/ 3.5/ 4/ 4.5/ 5/ 5.5/ 6/ 6.5; R7-14.5mm is 7/ 7.5/ 8/ 8.5/ 9/ 9.5/ 10/ 10.5/ 11/ 11.5/ 12/ 12.5/ 13/ 13.5/ 14/ 14.5; R15-25mm is 15/ 15.5/ 16/ 16.5/ 17/ 17.5/ 18/ 18.5/ 19/ 19.5/ 20/ 21/ 22/ 23/ 24/ 25.
  • [Wide Application] : Used for home improvement, machine installation,electric equipment, fit for designers, engineers, fitter, mechanics to measure the thickness or width of screw, valve, bearing ect.
  • [Easy to Use] : The radius measuring instrument has two types of leaves, each leaf is clearly marked, convenient to identify which leaf you need. So it can check the convex and concave surfaces. The convex pattern is used to detect the concave surface arc, and the concave template is used to detect the convex surface arc.
  • [Excellent Design] : The 360-degree Locking Screw design allows you to unfold or fold it easily.Laser Engraving treatment makes each leaf convenient to identify.
  • [Premium Quality] : Made of stainless steel material, rust-proof and corrosion resistant, high strength, good resilience, elegant appearance, durable and long lasting. NOTE : In order to prevent the feeler gauge from rusty and caton, the surface of each ruler is coated with anti-rust oil. Please do not mind!
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