Is aquarium thermometer profitable to sell on Amazon United States?

The niche generates $650K/yr across 15 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -16.0%. Flapen's verdict: Skip it (48/100).

How competitive is the aquarium thermometer niche?

12 brands and 26 sellers compete. The top 5 products take 71% of clicks and top 5 brands hold 83% of demand.

What do buyers complain about in aquarium thermometer?

Top complaints mined from reviews: Functionality-Overall, Durability, Battery Life. The return rate is 1.1%.

When does demand for aquarium thermometer peak?

Demand peaks in Aug; the busiest month runs 2.2× the quietest.

What does it cost to enter the aquarium thermometer niche?

Listings span $3.80–$17.83; the average listing price is $8.04 (sweet spot $15–$100). The average incumbent carries 2,641 reviews — the moat a new listing must climb.

aquarium thermometer

Skip it

Soft demand (-16.0% this quarter) — this niche doesn't clear our bar today.

Returns

Great1.1%

return rate — above 6% kills the launch gate

Conversion

Great10.3%

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

Market size

Good$650K

$650K/yr · 785K searches

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Review moat

Okay2,641.07

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay83%

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

Competition

Bad71%

top-5 click share — a locked-up shelf

Avg price

Bad$8.04

avg listing price — sweet spot $15–$100

Price range

Bad$3.80–$17.83

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

Growth

Bad-16.0%

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

According to Flapen's Amazon United States niche tracking, aquarium thermometer is a $650K/yr Amazon United States market (785K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Aug. Verdict: Skip it — 48/100.

Data updated Jul 17, 2026 · scored weekly · How we score niches

aquarium thermometer market data

Units sold / yr: 60K–80K; avg 4,000–5,000/product
Revenue / yr: $482K–$643K; units × avg price
Launch success: —; 2 of 3 new (360d)
Conversion rate: 10.3%
Avg BSR: #12
Page quality: 0%
Prime: 100%
Sponsored: 80%
Out of stock: 0.0%
Avg brand age: 49 months
Avg seller age: 177 days

Competition & brand share

The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.

Brands

12 falling

Sellers

Top-5 brand share

83%

Top 20: 100%

Top-5 click share

71%

Top 20: 100%

Open market

13%

PAIZOO32%
QZQ21%
AQUANEAT18%
Penn-Plax8%
WEIMELTOY4%
Zacro3%
Open — no brand owns it (6 brands, 13%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -16.0% search growth over the last 90 days.

Peak months: Aug · busiest ÷ quietest = 2.2×

Open Trend

Top aquarium thermometer search terms

aquarium thermometer259K/yr -18.2%8.3% conv.
fish tank thermometer142K/yr -19.2%9.6% conv.
aquarium thermometer digital46K/yr -18.3%10.2% conv.
thermometer for fish tank23K/yr -6.3%7.4% conv.
tank thermometer15K/yr +36.7%7.8% conv.
digital aquarium thermometer22K/yr -12.7%7.4% conv.
fish tank thermometer stick on19K/yr -18.5%10.8% conv.
aquarium temperature gauge17K/yr -11.8%8.7% conv.
aquarium thermometers146K/yr +0.3%2.4% conv.
aquarium thermometer strip14K/yr -22.9%6.3% conv.

All search terms

Top aquarium thermometer 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 15 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

PAIZOO Fish Tank Digital Thermometer Accurate LED Display to 0.9F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish Axolotl Turtle or Aquatic

PAIZOO$9.624.5★6,018 rev

QZQ Fish Tank Thermometer Aquarium Thermometer Wireless Touch Stick Digital Aquarium Thermometer LED Display 1F for Monitoring The Fish Tank Aquarium Temperature Accessories (Black)

QZQ$6.414.6★1,858 rev

AQUANEAT Aquarium Thermometer Fish Tank Thermometer Digital Temperature Test with Large LCD Display (1 Pack)

AQUANEAT$4.364.3★6,920 rev

Penn-Plax Therma-Temp Floating Aquarium Thermometer - Easy to Read - Temperature Gauge with Optional Suction Cup & Removable Mount - Safe for Freshwater & Saltwater Tanks - Multicolor 4.25 Inches

Penn-Plax$7.714.3★1,615 rev

AQUANEAT 2 Pack Aquarium Thermometer Fish Tank Thermometer Digital Temperature Test with Large LCD Display

AQUANEAT$8.054.4★1,317 rev

Newest

by launch date

Novique Digital Aquarium Thermometer Fish Tank Thermometer Test with Large LCD Display Fahrenheit/Celsius(/) for Aquarium Reptile Terrarium Turtle Tank

Novique$5.0657 rev

8mo ago

Carefree Fish Aquarium Digital Thermometer Cordless Replaceable Battery LED Display Temperature Measurement Error 0.9(US Patent Number:D1038779S)

Carefree Fish$7.70146 rev

11mo ago

QZQ Fish Tank Thermometer Aquarium Thermometer Wireless Touch Stick Digital Aquarium Thermometer LED Display 1F for Monitoring The Fish Tank Aquarium Temperature Accessories (2 Pack Black)

QZQ$9.931,858 rev

11mo ago

DaToo Aquarium Thermometer with Large LCD Display Fahrenheit/Celsius(/) Fish Tank Thermometer for Aquarium Reptile Terrarium Digital Water Thermometer with Suction Cup

DaToo$3.80359 rev

1y ago

Aquarium Thermometer Digital Fish Tank Thermometer Led Display Fish Tank Temperature Gauge Accurate Thermometer to 1 for Betta Axolotl Turtle Tank (with Spare Battery)

WEIMELTOY$6.35595 rev

1y ago

What buyers say about aquarium thermometer

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

What buyers love

Ease Of Use22%

“Easy to read”

Quality-Overall15%

“Good quality and accurate”

Value For Money14%

“fair price”

Advertised Vs Actual Product10%

“Just as described”

Efficiency5%

“Does the job”

Size-Overall4%

“Great size”

Adhesion/Stickiness3%

“I have had no issues with the stickiness”

Design-Overall3%

“It's accurate and looks aesthetically pleasing”

Durability3%

“durable”

Ease Of Cleaning3%

“Easy, clean”

What buyers complain about

Functionality-Overall16%

“not at all functional”

Durability11%

“Broke”

Battery Life9%

“Short battery life”

Adhesion/Stickiness9%

“Missing Adhesive”

Quality-Overall8%

“Poor quality”

Value For Money6%

“Not worth the 10$”

Ease Of Use5%

“found it impossible to do so”

Size-Overall4%

“Small and easy to place”

Water Resistance3%

“Got water in it the first day and ruined”

Heating3%

“it was 4 degrees off”

Top return reasons

Functionality-Overall27%

Heating16%

Display-Overall15%

Advertised Vs Actual Product7%

Defective Material/Parts7%

Adhesion/Stickiness7%

Size-Overall5%

Value For Money5%

Battery Life2%

Product Condition1%

Common questions

Is aquarium thermometer profitable to sell on Amazon United States?: The niche generates $650K/yr across 15 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -16.0%. Flapen's verdict: Skip it (48/100).
How competitive is the aquarium thermometer niche?: 12 brands and 26 sellers compete. The top 5 products take 71% of clicks and top 5 brands hold 83% of demand.
What do buyers complain about in aquarium thermometer?: Top complaints mined from reviews: Functionality-Overall, Durability, Battery Life. The return rate is 1.1%.
When does demand for aquarium thermometer peak?: Demand peaks in Aug; the busiest month runs 2.2× the quietest.
What does it cost to enter the aquarium thermometer niche?: Listings span $3.80–$17.83; the average listing price is $8.04 (sweet spot $15–$100). The average incumbent carries 2,641 reviews — the moat a new listing must climb.