relay tester
Skip itSoft demand (-16.1% this quarter) — this niche doesn't clear our bar today.
Market size
Great$1.5M$1.5M/yr · 1.2M searches
Avg price
Great$68.77avg listing price — sweet spot $15–$100
Review moat
Great326.36avg incumbent reviews — the moat a new listing must climb
Returns
Good2.5%return rate — above 6% kills the launch gate
Price range
Good$14.74–$163.34cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Okay87%top-5 brand share — brands hold most of the demand
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Conversion
Bad1.7%search→purchase rate — share of searches ending in a sale
Competition
Bad76%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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Performance Tool 3009 Compact Cordless Automotive Relay Tester for 12 Volt 4 and 5 pin relays and More
Performance Tool$46.574.5★1,164 rev
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$47.834.5★368 rev
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$52.164.6★187 rev
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$19.924.6★357 rev
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$45.044.6★325 rev
Newest
by launch date
KONNWEI KW371 Battery Tester & Relay Tester 2 in 1
KONNWEI$68.9510 rev
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$16.217 rev
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$20.8941 rev
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$52.16187 rev
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$45.04325 rev
Trending
90-day click momentumKONNWEI KW371 Battery Tester & Relay Tester 2 in 1
KONNWEI$68.955.0★
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$16.214.8★
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$20.894.4★
Weasch 9038A Relay Bypass Switch Kit Amp Loop Fuel Pump Bypass Kit Relay Tester Pack of 6 (9038A W/Wire)
Weasch$14.744.6★
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$47.834.5★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -16.1% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.6×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Relay tester works as should”
“Comes in handy when needed”
“This is a solid product”
“Works as advertised”
“Money well spent”
“The battery testing functions are easy to use and provide detailed information about battery condition, state of charge, voltage, and overall health”
“Great troubleshooting tool”
“Sturdy and easy”
“Well worth the purchase with this one fix”
“Easy to use light weight good tool to have”
What buyers complain about
“Not compatible with Ford”
“Did not work”
“Doesnt fit em all”
“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”
“Dies quickly and only works for a couple jumps”
“This item probably will be returned”
“Waste of $”
“Bad tester”
“Not strong enough to jump all types of cars”
“Has corroded batteries in it”