Is coolant test strips profitable to sell on Amazon United States?

The niche generates $240K/yr across 10 tracked products. 90-day search growth is +14.6%. Flapen's verdict: Worth a look (55/100).

How competitive is the coolant test strips niche?

8 brands and 39 sellers compete. The top 5 products take 78% of clicks and top 5 brands hold 88% of demand.

What do buyers complain about in coolant test strips?

Top complaints mined from reviews: Durability, Quality-Overall, Value For Money. The return rate is 1.3%.

When does demand for coolant test strips peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the coolant test strips niche?

Listings span $6.03–$77.60; the average listing price is $29.81 (sweet spot $15–$100). The average incumbent carries 532 reviews — the moat a new listing must climb.

coolant test strips

Worth a look

Shows a sweet-spot price point ($29.81 avg), but a concentrated shelf (top 5 take 78% of clicks) keeps it on the watch list.

Avg price

Incredible$29.81

avg listing price — sweet spot $15–$100

Returns

Great1.3%

return rate — above 5% kills the launch gate

Price range

Great$6.03–$77.60

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

Conversion

Great8.3%

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

Review moat

Good531.7

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Market size

Okay$240K

$240K/yr · 97K searches

Growth

Okay+14.6%

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

Brand share

Okay88%

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

Competition

Bad78%

top-5 click share — a locked-up shelf

According to Flapen's Amazon United States niche tracking, coolant test strips is a $240K/yr Amazon United States market (97K searches/yr). The top 5 brands hold 88% of demand. Verdict: Worth a look — 55/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

coolant test strips market data

Units sold / yr: 8K–10K; avg 750–1,000/product
Revenue / yr: $238K–$298K; units × avg price
Conversion rate: 8.3%
Avg BSR: #70
Page quality: 0%
Prime: 90%
Sponsored: 80%
Out of stock: 5.4%
Avg brand age: 55 months
Avg seller age: 171 days

Competition & brand share

The top 5 products capture 78% of clicks — a locked-up shelf that new listings rarely crack.

Brands

8 rising

Sellers

Top-5 brand share

88%

Top 20: 100%

Top-5 click share

78%

Top 20: 100%

Open market

Phoenix Systems60%
Robinair10%
Aicevoos9%
ecocstm5%
Baldwin Filters5%
Wix5%
Open — no brand owns it (2 brands, 7%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +14.6% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top coolant test strips search terms

coolant test strips39K/yr +17.7%6.4% conv.
brake fluid test strips33K/yr +7.6%6.2% conv.
antifreeze test strips8K/yr -0.5%4.6% conv.
coolant test strips for antifreeze3K/yr +70.9%7.2% conv.
coolant ph test strips3K/yr +86.5%5.4% conv.
ford diesel coolant additive test kit4K/yr -7.7%2.1% conv.
brake fluid tester strips5K/yr +14.4%5.2% conv.
coolant and brake fluid test strips3K/yr +12.4%8.9% conv.

All search terms

Top coolant test strips 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 10 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Phoenix Systems 8006-B Double-Ended Brake Fluid + Coolant Test Strips (15 foil wrapped test strips) 1 Pack

Phoenix Systems$16.374.6★1,383 rev

Robinair 75134 Econo-Clean Coolant Test Strip - Use to Test and Adjust Coolant for Proper Protection; Compatible with all Ethylene Glycol and Propylene Glycol Coolants - 50 Piece

Robinair$36.954.2★121 rev

Aicevoos NF Brake Fluid Tester Pen Brake Fluid Test Strips Calibrated for DOT3 DOT4 DOT-5.1 Brake Fluid

Aicevoos$12.974.5★1,213 rev

Antifreeze Coolant Tester Coolant Test Strips C and F Display Dial Type Antifreeze Tester Automotive 6/12/24V Car Battery Liquid Densitometer for Ethylene Glycol Coolant

ecocstm$7.504.7★27 rev

BrakeStrip Plus Service Center Kit. Double Ended Brake Fluid Plus Coolant Test Strips and Rating Scale Cards

Phoenix Systems$77.604.6★31 rev

Newest

by launch date

Antifreeze Coolant Tester Coolant Test Strips C and F Display Dial Type Antifreeze Tester Automotive 6/12/24V Car Battery Liquid Densitometer for Ethylene Glycol Coolant

ecocstm$7.5027 rev

1y ago

Brake Fluid Liquid Tester Pen 1PC DOT 3 DOT 4 DOT 5.1 Brake Fluid Liquid Tester Pen Car Diagnostic Testing Tool with 5 LED Indicators Hydraulic Fluid Liquid Oil Moisture Analyzer

YOGEIER$6.031,235 rev

3y ago

Aicevoos NF Brake Fluid Tester Pen Brake Fluid Test Strips Calibrated for DOT3 DOT4 DOT-5.1 Brake Fluid

Aicevoos$12.971,213 rev

3y ago

BrakeStrip Plus Service Center Kit. Double Ended Brake Fluid Plus Coolant Test Strips and Rating Scale Cards

Phoenix Systems$77.6031 rev

4y ago

Phoenix Systems 8006-B Double-Ended Brake Fluid + Coolant Test Strips (15 foil wrapped test strips) 1 Pack

Phoenix Systems$16.371,383 rev

8y ago

What buyers say about coolant test strips

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

What buyers love

Ease Of Use24%

“Easy to use”

Value For Money16%

“Worth on money”

Efficiency13%

“Works Well”

Quality-Overall10%

“Good quality”

Coolant6%

“coolant these are a must have”

Advertised Vs Actual Product6%

“Works just as described”

Maintenance And Repair4%

“Great way to extend the Maintenance Interval on my Tesla Model Y”

Durability3%

“Good for a few uses before it breaks apart”

Measurement/Reading Accuracy3%

“Way better and more accurate than floating gauges for coolant”

Battery Life2%

“Battery was easy to install”

What buyers complain about

Durability28%

“Broke after first use”

Quality-Overall12%

“Garbage”

Value For Money7%

“Also a bit expensive”

Measurement/Reading Accuracy7%

“And the accuracy is unreliable”

Instructions/User Manual/Troubleshooting5%

“The instructions are beyond confusing”

Material Quality5%

“Cheap plastic”

Size-Overall4%

“Probe End Too Wide to Fit”

Ease Of Use3%

“It doesnt get much easier to use”

Sensor3%

“Sensors does not work properly”

Color2%

“it still shows a bit of color change”

Top return reasons

Functionality-Overall16%

Measurement/Reading Accuracy15%

Coolant12%

Defective Material/Parts9%

Advertised Vs Actual Product9%

Value For Money7%

Durability5%

Compatibility-Overall4%

Size-Overall3%

Display-Overall2%

Common questions

Is coolant test strips profitable to sell on Amazon United States?: The niche generates $240K/yr across 10 tracked products. 90-day search growth is +14.6%. Flapen's verdict: Worth a look (55/100).
How competitive is the coolant test strips niche?: 8 brands and 39 sellers compete. The top 5 products take 78% of clicks and top 5 brands hold 88% of demand.
What do buyers complain about in coolant test strips?: Top complaints mined from reviews: Durability, Quality-Overall, Value For Money. The return rate is 1.3%.
When does demand for coolant test strips peak?: Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the coolant test strips niche?: Listings span $6.03–$77.60; the average listing price is $29.81 (sweet spot $15–$100). The average incumbent carries 532 reviews — the moat a new listing must climb.