Is relay tester profitable to sell on Amazon United Kingdom?

The niche generates £60K/yr across 20 tracked products. 0 of 12 products launched in the last 360 days are still selling. 90-day search growth is -19.4%. Flapen's verdict: Worth a look (57/100).

How competitive is the relay tester niche?

19 brands and 28 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 58% of demand.

What do buyers complain about in relay tester?

Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Size-Overall. The return rate is 2.0%.

What does it cost to enter the relay tester niche?

Listings span £7.06–£37.62; the average listing price is £15.10 (sweet spot $15–$100). The average incumbent carries 28 reviews — the moat a new listing must climb.

relay tester

Worth a look

Shows a thin review moat (28 avg reviews), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Review moat

Incredible28.3

avg incumbent reviews — the moat a new listing must climb

Conversion

Great10.4%

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

Quality gap

Great4.1★

avg incumbent rating — lower means beatable quality

Brand share

Great58%

top-5 brand share — no brand owns this niche

Returns

Great2.0%

return rate — above 5% kills the launch gate

Avg price

Great£15.10

avg listing price — sweet spot $15–$100

Price range

Good£7.06–£37.62

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

Competition

Good55%

top-5 click share — leaders hold, buyers still browse

Market size

Bad£60K

£60K/yr · 38K searches

Growth

Bad-19.4%

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

Signals No Dominant Brand Low Review Barrier

According to Flapen's Amazon United Kingdom niche tracking, relay tester is a £60K/yr Amazon United Kingdom market (38K searches/yr). The top 5 brands hold 58% of demand. Verdict: Worth a look — 57/100.

Data updated Jul 18, 2026 · scored weekly · How we score niches

relay tester market data

Units sold / yr: 3K–4K; avg 100–250/product
Revenue / yr: £45K–£60K; units × avg price
Conversion rate: 10.4%
Avg BSR: #344
Page quality: 0%
Prime: 95%
Sponsored: 90%
Out of stock: 8.0%
Avg brand age: 28 months
Avg seller age: 214 days

Competition & brand share

The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.

Brands

19 falling

Sellers

Top-5 brand share

58%

Top 20: 100%

Top-5 click share

55%

Top 20: 100%

Open market

36%

OBDResource19%
DUZEPA14%
Cloudpower9%
XINZHIZHU8%
GEARLEADER7%
Aivane6%

Demand

Weekly Amazon search volume, last 22 weeks — -19.4% search growth over the last 90 days.

Open Trend

Top relay tester search terms

relay tester27K/yr -16.3%7.7% conv.
car relay tester6K/yr -13.4%7.7% conv.
relay tester 12-24v5K/yr -39.9%8.8% conv.

All search terms

Top relay tester 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.

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

All 20 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Relay Tester 12-24v Car Relas Tester 12/24v Car Relas Testser Automotive Relaye Testser Circuit System Diagnostic Repair Tool For Vehicles Rvs Boats And Campers

OBDResource£20.254.3★60 rev

DUZEPA Car Relay Tester RT01 4-Pin 5-Pin Detection Tool with LCD Display for 12V and 24V Relays in Multiple Vehicle Types and Applications

DUZEPA£10.904.1★20 rev

Relay Analyzer For 12V And 24V Systems Automotive Relay Test Meter With Digital Display Power Analyzer Car for battery Tester Motorcycle Circuit Sensor Test Box

Cloudpower£10.364.2★19 rev

12V Automotive Relay Tester Car Electronic Relay Circuit Tester Kit Diagnostic Tools Battery Checker Universal 4PIN 5PIN Fast Testing with LED Indicator Lights for Trucks Cars Electrical System

XINZHIZHU£9.434.0★29 rev

GEARLEADER 12V Automotive Electronic Relay Tester Car Relay Tester Universal LED Indicator Light Car Battery Checker 4PIN 5PIN Fast Testing

GEARLEADER£12.213.9★16 rev

Newest

by launch date

Automotive Relay Tester 12-24V Universal Car Battery Alternator Checker with Clips 4PIN/5PIN Fast Testing Tool with LED Indicator Circuit System Diagnostic Repair Tool for Cars Trucks RVs Boats

Pretify£7.065 rev

4mo ago

RT01 Automotive Relay Tester Relay Analyzer For 12V And 24V Systems Car for battery Tester Motorcycle Circuit Sensor With Digital Display (RT01-BF01)

GLOBALHUT£9.772 rev

4mo ago

Relay Tester 12V-24V Automotive Car Relays Tester 4 Pin 5 Pin Relay Detection Diagnostic Tool Circuit System Diagnostic Repair Tool Battery/Type-C for Auto Motorcycle Rvs Boats Campers

Delousiber£33.493 rev

6mo ago

12V Relay Tester Car Fuse Tester with 4PIN/5PIN Fast Testing Clips

oibek£8.3711 rev

7mo ago

Automotive Current Tester Car Circuit Relay Fuse Tester High-Precision Current Tester Fault Detection with Backlit Display 20A 48V Car Battery Tester Including a Electrical Tape

Wsndyjia£14.012 rev

7mo ago

What buyers say about relay tester

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

What buyers love

Ease Of Use26%

“Easy to use”

Quality-Overall20%

“Well built and accurate”

Value For Money14%

“A lot better than the cheaper options on amazon”

Efficiency8%

“Tester is good excellent works well”

Advertised Vs Actual Product7%

“it did the job”

Compatibility-Overall5%

“The compatibility is excellent, easily covering all the 4-pin and 5-pin relays I encounter on cars, bikes, and even a friends boat”

Maintenance And Repair3%

“Ok fixed it”

Functionality-Overall3%

“Works perfectly i tried it on a known good relay it was correct”

Add-Ons/Attachments2%

“Well pleased and well worth the cost, brilliant accessory”

Size-Overall1%

“Easy to fit”

What buyers complain about

Functionality-Overall26%

“Did not work”

Quality-Overall13%

“Sadly I had to rate this item as 3 stars as its very cheaply made”

Size-Overall12%

“One thing to note: the leads are very short”

Compatibility-Overall8%

“Does not fit relays”

Natural Resource Wastage8%

“Waste of no ey”

Instructions/User Manual/Troubleshooting5%

“No instructions”

Defective Material/Parts5%

“Shows fault relay when it was working”

Add-Ons/Attachments3%

“the black crocodile clip isn't even connected”

Product Condition3%

“this was supposed to be a brand new item”

Value For Money3%

“Not worth the money, avoid”

Top return reasons

Compatibility-Overall22%

Functionality-Overall21%

Size-Overall18%

Defective Material/Parts16%

Connectivity-Overall8%

Advertised Vs Actual Product3%

Quality-Overall3%

Value For Money2%

Brightness/Shine/Glow1%

Product Condition1%

Common questions

Is relay tester profitable to sell on Amazon United Kingdom?: The niche generates £60K/yr across 20 tracked products. 0 of 12 products launched in the last 360 days are still selling. 90-day search growth is -19.4%. Flapen's verdict: Worth a look (57/100).
How competitive is the relay tester niche?: 19 brands and 28 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 58% of demand.
What do buyers complain about in relay tester?: Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Size-Overall. The return rate is 2.0%.
What does it cost to enter the relay tester niche?: Listings span £7.06–£37.62; the average listing price is £15.10 (sweet spot $15–$100). The average incumbent carries 28 reviews — the moat a new listing must climb.