---
title: "relay tester — Niche Verdict: Skip it (44/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/relay-tester"
last_updated: "2026-07-14T03:21:39.529Z"
locale: en
meta:
  description: "soft demand (-16.1% this quarter) — relay tester doesn't clear our bar today."
  "og:description": "soft demand (-16.1% this quarter) — relay tester doesn't clear our bar today."
  "og:title": "relay tester — Niche Verdict: Skip it (44/100) | Amazon United States - Flapen"
---

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# **relay tester**

**Skip it**

Soft demand (-16.1% this quarter) — this niche doesn't clear our bar today.

Market size 86Growth 17Conversion 22Competition 20Returns 62Price range 57Avg price 86Brand share 30Review moat 84Quality gap 24

**Market size**

**Great****$1.5M**

$1.5M/yr · 1.2M searches

**Avg price**

**Great****$68.77**

avg listing price — sweet spot $15–$100

**Review moat**

**Great****326.36**

avg incumbent reviews — the moat a new listing must climb

**Returns**

**Good****2.5%**

return rate — above 6% kills the launch gate

**Price range**

**Good****$14.74–$163.34**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Brand share**

**Okay****87%**

top-5 brand share — brands hold most of the demand

**Quality gap**

**Bad****4.6★**

avg incumbent rating — lower means beatable quality

**Conversion**

**Bad****1.7%**

search→purchase rate — share of searches ending in a sale

**Competition**

**Bad****76%**

top-5 click share — a locked-up shelf

**Growth**

**Bad****-16.1%**

90-day search growth — must beat 0% to launch

## **Competition**

The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**11 **▲rising

**Sellers**

**54**

**Top-5 brand share**

**87%**

**Open market**

**9%**

- Sound Troubleshooting42% - Performance Tool24% - RVMARINEPAT9% - Relay Buddy6% - Lisle5% - KONNWEI4% - Open — no brand owns it (5 brands, 9%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$147K20%$293K30%$440K40%$586K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 14 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Performance Tool 3009 Compact Cordless Automotive Relay Tester for 12 Volt 4 and 5 pin relays and More](https://m.media-amazon.com/images/I/41rLSCJdq7L.jpg)**Performance Tool 3009 Compact Cordless Automotive Relay Tester for 12 Volt 4 and 5 pin relays and More**Performance Tool**$46.57**4.5★1,164 rev](https://www.amazon.com/dp/B0CB711FNB) [2![Sound Troubleshooting Automotive Relay Tester with Relay Puller - 12V Auto Relay Diagnostic Tool Car Relay Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented](https://m.media-amazon.com/images/I/41jOGIte5aL.jpg)**Sound Troubleshooting Automotive Relay Tester with Relay Puller - 12V Auto Relay Diagnostic Tool Car Relay Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented**Sound Troubleshooting**$47.83**4.5★368 rev](https://www.amazon.com/dp/B0DSM43JZV) [3![12V Automotive Relay Tester Car Battery & Alternator Test Kit | Relay Switch & Circuit Inspector | Tests 4 & 5 Pin Relays | Battery Tester | Alternator Tester | Sound Troubleshooting | Patented](https://m.media-amazon.com/images/I/41iDx2bDSnL.jpg)**12V Automotive Relay Tester Car Battery & Alternator Test Kit | Relay Switch & Circuit Inspector | Tests 4 & 5 Pin Relays | Battery Tester | Alternator Tester | Sound Troubleshooting | Patented**Sound Troubleshooting**$52.16**4.6★187 rev](https://www.amazon.com/dp/B0FNTBJ97J) [4![RVMARINEPAT Relay Bypass Switch 9038 Relay Tester Kit Diagnostic Tester Scan Tool & Fuel Pump Relay Bypass Master Kit Replaces 9036 9037 Compatible with Domestic GM BMW Audi Chrysler 6-Pack](https://m.media-amazon.com/images/I/415vSIYacjL.jpg)**RVMARINEPAT Relay Bypass Switch 9038 Relay Tester Kit Diagnostic Tester Scan Tool & Fuel Pump Relay Bypass Master Kit Replaces 9036 9037 Compatible with Domestic GM BMW Audi Chrysler 6-Pack**RVMARINEPAT**$19.92**4.6★357 rev](https://www.amazon.com/dp/B0D81S5Q6N) [5![Sound Troubleshooting Automotive Relay Tester - 4 & 5 Pin 12V Auto Diagnostic Tool Small Handheld DIY Car Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented](https://m.media-amazon.com/images/I/41p8TuezW4L.jpg)**Sound Troubleshooting Automotive Relay Tester - 4 & 5 Pin 12V Auto Diagnostic Tool Small Handheld DIY Car Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented**Sound Troubleshooting**$45.04**4.6★325 rev](https://www.amazon.com/dp/B0DYPJQ2YX)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![KONNWEI KW371 Battery Tester & Relay Tester 2 in 1](https://m.media-amazon.com/images/I/51Yrc9JPj3L.jpg)**KONNWEI KW371 Battery Tester & Relay Tester 2 in 1**KONNWEI**$68.95**10 rev1mo ago](https://www.amazon.com/dp/B0GWQN5NS2) [![Relay Tester with Battery Car Fuse Tester Automotive Circuit Fault Probe Tester Power Circuit Probe Testers High-Precision Current Probe Testers Circuit Testers Automotive with Test Light](https://m.media-amazon.com/images/I/414gvujjpTL.jpg)**Relay Tester with Battery Car Fuse Tester Automotive Circuit Fault Probe Tester Power Circuit Probe Testers High-Precision Current Probe Testers Circuit Testers Automotive with Test Light**HGZHNAT**$16.21**7 rev4mo ago](https://www.amazon.com/dp/B0GQ9TF6S5) [![Car Fuse Relay Tester Automotive Probador De Relay Automotriz Circuit Fusibles De Carro 12v Corriente Automotriz Probe Tester Tool Parasitic Draw Auto Testeador Test Light Breaker Finder](https://m.media-amazon.com/images/I/41ODs1LwMVL.jpg)**Car Fuse Relay Tester Automotive Probador De Relay Automotriz Circuit Fusibles De Carro 12v Corriente Automotriz Probe Tester Tool Parasitic Draw Auto Testeador Test Light Breaker Finder**Dojavop**$20.89**41 rev7mo ago](https://www.amazon.com/dp/B0G4DCHXMB) [![12V Automotive Relay Tester Car Battery & Alternator Test Kit | Relay Switch & Circuit Inspector | Tests 4 & 5 Pin Relays | Battery Tester | Alternator Tester | Sound Troubleshooting | Patented](https://m.media-amazon.com/images/I/41iDx2bDSnL.jpg)**12V Automotive Relay Tester Car Battery & Alternator Test Kit | Relay Switch & Circuit Inspector | Tests 4 & 5 Pin Relays | Battery Tester | Alternator Tester | Sound Troubleshooting | Patented**Sound Troubleshooting**$52.16**187 rev10mo ago](https://www.amazon.com/dp/B0FNTBJ97J) [![Sound Troubleshooting Automotive Relay Tester - 4 & 5 Pin 12V Auto Diagnostic Tool Small Handheld DIY Car Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented](https://m.media-amazon.com/images/I/41p8TuezW4L.jpg)**Sound Troubleshooting Automotive Relay Tester - 4 & 5 Pin 12V Auto Diagnostic Tool Small Handheld DIY Car Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented**Sound Troubleshooting**$45.04**325 rev1y ago](https://www.amazon.com/dp/B0DYPJQ2YX)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![KONNWEI KW371 Battery Tester & Relay Tester 2 in 1](https://m.media-amazon.com/images/I/51Yrc9JPj3L.jpg)**KONNWEI KW371 Battery Tester & Relay Tester 2 in 1**KONNWEI**$68.95**5.0★**▲ 293%**](https://www.amazon.com/dp/B0GWQN5NS2) [![Relay Tester with Battery Car Fuse Tester Automotive Circuit Fault Probe Tester Power Circuit Probe Testers High-Precision Current Probe Testers Circuit Testers Automotive with Test Light](https://m.media-amazon.com/images/I/414gvujjpTL.jpg)**Relay Tester with Battery Car Fuse Tester Automotive Circuit Fault Probe Tester Power Circuit Probe Testers High-Precision Current Probe Testers Circuit Testers Automotive with Test Light**HGZHNAT**$16.21**4.8★**▲ 292%**](https://www.amazon.com/dp/B0GQ9TF6S5) [![Car Fuse Relay Tester Automotive Probador De Relay Automotriz Circuit Fusibles De Carro 12v Corriente Automotriz Probe Tester Tool Parasitic Draw Auto Testeador Test Light Breaker Finder](https://m.media-amazon.com/images/I/41ODs1LwMVL.jpg)**Car Fuse Relay Tester Automotive Probador De Relay Automotriz Circuit Fusibles De Carro 12v Corriente Automotriz Probe Tester Tool Parasitic Draw Auto Testeador Test Light Breaker Finder**Dojavop**$20.89**4.4★**▲ 243%**](https://www.amazon.com/dp/B0G4DCHXMB) [![Weasch 9038A Relay Bypass Switch Kit Amp Loop Fuel Pump Bypass Kit Relay Tester Pack of 6 (9038A W/Wire)](https://m.media-amazon.com/images/I/413T7l7HXdL.jpg)**Weasch 9038A Relay Bypass Switch Kit Amp Loop Fuel Pump Bypass Kit Relay Tester Pack of 6 (9038A W/Wire)**Weasch**$14.74**4.6★**▲ 77%**](https://www.amazon.com/dp/B0DSZGT5T9) [![Sound Troubleshooting Automotive Relay Tester with Relay Puller - 12V Auto Relay Diagnostic Tool Car Relay Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented](https://m.media-amazon.com/images/I/41jOGIte5aL.jpg)**Sound Troubleshooting Automotive Relay Tester with Relay Puller - 12V Auto Relay Diagnostic Tool Car Relay Tester with Battery Clips Relay Testing Kit Electrical Systems Tool | Patented**Sound Troubleshooting**$47.83**4.5★**▲ 28%**](https://www.amazon.com/dp/B0DSM43JZV)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — -16.1% search growth over the last 90 days.

30K20KSpike '24Spike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.6×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Efficiency**22%

*“Relay tester works as should”*

**Ease Of Use**17%

*“Comes in handy when needed”*

**Quality-Overall**16%

*“This is a solid product”*

**Advertised Vs Actual Product**14%

*“Works as advertised”*

**Value For Money**9%

*“Money well spent”*

**Battery Life**4%

*“The battery testing functions are easy to use and provide detailed information about battery condition, state of charge, voltage, and overall health”*

**Instructions/User Manual/Troubleshooting**3%

*“Great troubleshooting tool”*

**Strength**3%

*“Sturdy and easy”*

**Maintenance And Repair**2%

*“Well worth the purchase with this one fix”*

**Weight Light**1%

*“Easy to use light weight good tool to have”*

### **What buyers complain about **

**Compatibility-Overall**26%

*“Not compatible with Ford”*

**Functionality-Overall**16%

*“Did not work”*

**Size-Overall**11%

*“Doesnt fit em all”*

**Battery Life**10%

*“went to use it again a few months latter put batterys back in it wont work put new batterys in it still does not work”*

**Durability**5%

*“Dies quickly and only works for a couple jumps”*

**Product Condition**5%

*“This item probably will be returned”*

**Natural Resource Wastage**3%

*“Waste of $”*

**Quality-Overall**3%

*“Bad tester”*

**Strength**2%

*“Not strong enough to jump all types of cars”*

**Rusts/Corrodes**2%

*“Has corroded batteries in it”*

### **Top return reasons **

**Compatibility-Overall**32%

**Functionality-Overall**23%

**Size-Overall**16%

**Defective Material/Parts**6%

**Advertised Vs Actual Product**6%

**Value For Money**4%

**Connectivity-Overall**2%

**Quality-Overall**2%

**Socket/Port/Plug**2%

**Product Condition**1%