string action gauge
Skip itSoft demand (-28.1% this quarter) — this niche doesn't clear our bar today.
Returns
Incredible0.8%return rate — above 5% kills the launch gate
Conversion
Great11.6%search→purchase rate — share of searches ending in a sale
Avg price
Great$16.54avg listing price — sweet spot $15–$100
Review moat
Good606avg incumbent reviews — the moat a new listing must climb
Price range
Good$4.47–$37.62cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Market size
Okay$185K$185K/yr · 96K searches
Competition
Bad72%top-5 click share — a locked-up shelf
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Growth
Bad-28.1%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, string action gauge is a $185K/yr Amazon United States market (96K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in Jan. Verdict: Skip it — 47/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
string action gauge market data
- Units sold / yr
- 10K–13K
- avg 500–750/product
- Revenue / yr
- $165K–$207K
- units × avg price
- Conversion rate
- 11.6%
- Avg BSR
- #138
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 85%
- Out of stock
- 0.0%
- Avg brand age
- 48 months
- Avg seller age
- 185 days
Competition & brand share
The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.Brands
11 falling
Sellers
31
Top-5 brand share
76%
Top 20: 100%
Top-5 click share
72%
Top 20: 100%
Open market
19%
- Junlego30%
- Kayoubi16%
- MusicNomad13%
- D'Addario10%
- Msuhettu6%
- FretGuru6%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -28.1% search growth over the last 90 days.Peak months: Jan · busiest ÷ quietest = 1.9×
Top string action gauge search terms
- string action gauge24K/yr
- guitar action gauge18K/yr
- guitar string height gauge15K/yr
- guitar ruler7K/yr
- guitar string action gauge9K/yr
- string height gauge7K/yr
- guitar action ruler5K/yr
- string action ruler5K/yr
- guitar string gauge4K/yr
- guitar string gauge measuring tool3K/yr
Top string action gauge products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Guitar Action Gauge Ruler String Height Gauge for Guitar
Junlego$6.284.8★642 rev
Guitar Accessories String Action Gauge High Contrast Black Luthier Set up Tools with Dual Metric & Imperial Scales Smooth Edges & Protective PU Case for Acoustic Electric Guitars & Bass
Kayoubi$5.494.8★245 rev
DAddario Accessories String Height Gauge
D'Addario$10.724.5★501 rev
MusicNomad Precision String Action Gauge Ruler for String Height- Metric SAE 64ths (MN602)
MusicNomad$18.034.8★1,060 rev
String Action Gauge Ruler Upgraded Guitar String Height Gauge with Inch & Metric Scales Guitar String Setup Tool and Accessory for Electric Acoustic Bass and Luthier Use - Print Silver Edition
Msuhettu$4.474.6★150 rev
Newest
by launch date
String Action Gauge Ruler Professional Guitar Setup Tool with Dual mm & 1/64 Scales - for Electric Acoustic Bass Guitars - Includes Measurement Chart & Protective Sleeve - Print Silver Edition
FAITIO$7.0332 rev
Guitar Accessories String Action Gauge High Contrast Black Luthier Set up Tools with Dual Metric & Imperial Scales Smooth Edges & Protective PU Case for Acoustic Electric Guitars & Bass
Kayoubi$5.49245 rev
String Action Gauge Ruler Upgraded Guitar String Height Gauge with Inch & Metric Scales Guitar String Setup Tool and Accessory for Electric Acoustic Bass and Luthier Use - Print Silver Edition
Msuhettu$4.47150 rev
FretGuru XT Guitar String Action Gauge Pro Fret Rocker Bridge & Pickup Spacing Ruler Advanced Ultra-Precision MOAGG Technology Guitar Setup Tool for Luthiers with Fret Height/Fret Wear Checker
FretGuru$37.6268 rev
String Action Gauge for Guitars - Precision Setup Tool to Play Your Best - Guitar String Height Gauge - String Action Ruler with Easy-to-Read Markings
Powered By Rock$9.1978 rev
Trending
90-day click momentumString Action Gauge Ruler Professional Guitar Setup Tool with Dual mm & 1/64 Scales - for Electric Acoustic Bass Guitars - Includes Measurement Chart & Protective Sleeve - Print Silver Edition
FAITIO$7.034.6★
FretGuru String Action Gauge Guitar Fret Ruler Precision Fret Rocker Precise CNC Machined Diamond Honed Polished Edge Guitar String Height Gauge Luthier Tool with Genuine Leather Case
FretGuru$29.104.8★
StewMac String Action Gauge And Ruler Inches Stainless Steel - Designed by StewMac The Original measuring tool for acoustic and electric guitar and bass setup
StewMac$35.574.7★
Guitar Accessories String Action Gauge High Contrast Black Luthier Set up Tools with Dual Metric & Imperial Scales Smooth Edges & Protective PU Case for Acoustic Electric Guitars & Bass
Kayoubi$5.494.8★
String Action Gauge Ruler Guitar Height Gauge Set Up Tool for Electric Bass and Acoustic Guitar
myKimono$6.124.5★
What buyers say about string action gauge
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent Quality”
“Easy to use”
“Great price”
“Works as advertised”
“The string action is very easy to measure using this tool”
“High quality, with many useful features for accurately setting up guitars”
“Solid Product”
“It's made of quality steel”
“Very durable also”
“Talking with a nice faux leather case”
What buyers complain about
“Beware, however, it does not work for bass guitar”
“too expensive”
“Did not come with the pictured soft pouch”
“Instead of shiny, glaring, reflective metal with difficult to make out black lines, this is matte black with easy to see white lines”
“Hard to read”
“The color starts to fade a bit after use”
“Could have more instructions and included”
“the stainless it is made from is stiff”
“concerned about longevity”
Top return reasons
Common questions
- Is string action gauge profitable to sell on Amazon United States?
- The niche generates $185K/yr across 13 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -28.1%. Flapen's verdict: Skip it (47/100).
- How competitive is the string action gauge niche?
- 11 brands and 31 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in string action gauge?
- Top complaints mined from reviews: Bass, Value For Money, Advertised Vs Actual Product. The return rate is 0.8%.
- When does demand for string action gauge peak?
- Demand peaks in Jan; the busiest month runs 1.9× the quietest.
- What does it cost to enter the string action gauge niche?
- Listings span $4.47–$37.62; the average listing price is $16.54 (sweet spot $15–$100). The average incumbent carries 606 reviews — the moat a new listing must climb.