Is nitrate test kit profitable to sell on Amazon United States?

The niche generates $114K/yr across 13 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +43.5%. Flapen's verdict: Worth a look (54/100).

How competitive is the nitrate test kit niche?

12 brands and 68 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 81% of demand.

What do buyers complain about in nitrate test kit?

Top complaints mined from reviews: Functionality-Overall, Ease Of Use, Color. The return rate is 1.2%.

When does demand for nitrate test kit peak?

Demand peaks in Jun; the busiest month runs 2.8× the quietest.

What does it cost to enter the nitrate test kit niche?

Listings span $9.15–$64.26; the average listing price is $21.04 (sweet spot $15–$100). The average incumbent carries 2,008 reviews — the moat a new listing must climb.

nitrate test kit

Worth a look

Shows low returns (1.2%), but a concentrated shelf (top 5 take 76% of clicks) keeps it on the watch list.

Returns

Great1.2%

return rate — above 6% kills the launch gate

Avg price

Great$21.04

avg listing price — sweet spot $15–$100

Conversion

Great9.9%

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

Price range

Great$9.15–$64.26

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

Growth

Good+43.5%

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

Review moat

Okay2,007.77

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Okay81%

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

Market size

Okay$114K

$114K/yr · 54K searches

Competition

Bad76%

top-5 click share — a locked-up shelf

According to Flapen's Amazon United States niche tracking, nitrate test kit is a $114K/yr Amazon United States market (54K searches/yr). The top 5 brands hold 81% of demand. Demand peaks in Jun. Verdict: Worth a look — 54/100.

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

nitrate test kit market data

Units sold / yr: 5K–6K; avg 500–750/product
Revenue / yr: $105K–$126K; units × avg price
Launch success: —; 1 of 1 new (360d)
Conversion rate: 9.9%
Avg BSR: #89
Page quality: 0%
Prime: 100%
Sponsored: 54%
Out of stock: 0.0%
Avg brand age: 66 months
Avg seller age: 170 days

Competition & brand share

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

Brands

12 falling

Sellers

Top-5 brand share

81%

Top 20: 100%

Top-5 click share

76%

Top 20: 100%

Open market

14%

API27%
TESPERT25%
HACH18%
SJ WAVE6%
Watersafe5%
Hanna Instruments5%
Open — no brand owns it (6 brands, 14%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +43.5% search growth over the last 90 days.

Peak months: Jun · busiest ÷ quietest = 2.8×

Open Trend

Top nitrate test kit search terms

nitrate test kit46K/yr +51.5%9.5% conv.
nitrate test4K/yr +15.7%7.8% conv.
nitrite test kit5K/yr -11.3%7.8% conv.

All search terms

Top nitrate test kit 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 13 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

TESPERT Drinking Water Test Strips 125ct 16 in 1 30s Quick Screening for Hardness pH Iron Nitrite Copper Chlorine Nitrite Carbonate Lead Alkalinity...Well Tap Home City Water Testing

TESPERT$18.124.4★3,161 rev

API NITRATE 90-Test Freshwater and Saltwater Aquarium Water Test Kit

API$11.244.7★3,263 rev

Hach 2745425 Nitrate and Nitrite Test Strips

HACH$16.324.7★117 rev

API NITRITE TEST KIT 180-Test Freshwater and Saltwater Aquarium Test Kit

API$11.754.7★3,263 rev

SJ WAVE 22 in 1 Water Test Kits - 125 Strips Drinking Water Test Kit Home Tap and Well Water Tester for Bacteria pH Hardness Lead Iron Copper Chlorine Cyanuric Acid

SJ WAVE$18.704.3★7,448 rev

Newest

by launch date

All-New 23 in 1 Drinking Water Testing Kit 158 Strips Well Water Testing Kit & Water Test Strip for House Water for HardnessChlorine Copper Iron Lead pH and More

AESCULIX$20.19150 rev

11mo ago

Lead Water Test Kit 2026 Upgraded 8 in 1 Home Drinking Water Testing Kits 5pcs Independent Bag House Tap and Well Water Hardness Tester Lead Test Strips for Alkalinity pH Copper Nitrite&Chlorine

Qteeyou$9.15137 rev

1y ago

AAwipes 8-in-1 Aquarium Test Kit for Fish Tanks - Quick & Accurate Water Testing Strips for Aquariums & Ponds. Tests pH Ammonia Alkalinity Hardness Chlorine etc. (K02-50)

AAwipes$9.793,120 rev

2y ago

TESPERT Drinking Water Test Strips 125ct 16 in 1 30s Quick Screening for Hardness pH Iron Nitrite Copper Chlorine Nitrite Carbonate Lead Alkalinity...Well Tap Home City Water Testing

TESPERT$18.123,161 rev

4y ago

Hanna Instruments High Range Nitrate Checker HI782

Hanna Instruments$64.26714 rev

5y ago

What buyers say about nitrate test kit

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

What buyers love

Ease Of Use40%

“Makes things easier”

Value For Money13%

“very affordable”

Quality-Overall8%

“Overall, a reliable and practical product that I would definitely recommend”

Water Resistance8%

“Easy and reliable water testing at home”

Color7%

“the color chart is very accurate”

Instructions/User Manual/Troubleshooting6%

“easy instructions”

Measurement/Reading Accuracy5%

“So far, they seem accurate and consistent”

Advertised Vs Actual Product3%

“Works as advertised”

Filtration2%

“It helps to change the filters on time”

Efficiency1%

“Works well”

What buyers complain about

Functionality-Overall15%

“Does NOT detect Ammonia”

Ease Of Use9%

“Hard to use”

Color9%

“Color matching a little difficult”

Measurement/Reading Accuracy8%

“Inaccurate, random results”

Value For Money8%

“This checker is a bit expensive”

Advertised Vs Actual Product8%

“False advertisement”

Smell5%

“Chemical smell”

Quality-Overall5%

“Cheap and came with a lot of strips”

Contamination4%

“I realized that theres too much chemicals in my tap water”

Defective Material/Parts4%

“It must be a manufacturing defect”

Top return reasons

Functionality-Overall30%

Advertised Vs Actual Product21%

Value For Money8%

Color8%

Product Condition5%

Measurement/Reading Accuracy5%

Defective Material/Parts5%

Certifications4%

Ease Of Use3%

Instructions/User Manual/Troubleshooting2%

Common questions

Is nitrate test kit profitable to sell on Amazon United States?: The niche generates $114K/yr across 13 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +43.5%. Flapen's verdict: Worth a look (54/100).
How competitive is the nitrate test kit niche?: 12 brands and 68 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 81% of demand.
What do buyers complain about in nitrate test kit?: Top complaints mined from reviews: Functionality-Overall, Ease Of Use, Color. The return rate is 1.2%.
When does demand for nitrate test kit peak?: Demand peaks in Jun; the busiest month runs 2.8× the quietest.
What does it cost to enter the nitrate test kit niche?: Listings span $9.15–$64.26; the average listing price is $21.04 (sweet spot $15–$100). The average incumbent carries 2,008 reviews — the moat a new listing must climb.