h2s monitor
Skip itBrand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.
Review moat
Great228avg incumbent reviews — the moat a new listing must climb
Returns
Great1.7%return rate — above 5% kills the launch gate
Avg price
Great$94.82avg listing price — sweet spot $15–$100
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Conversion
Good5.7%search→purchase rate — share of searches ending in a sale
Market size
Good$472K$472K/yr · 88K searches
Price range
Okay$45.04–$222.25cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay70%top-5 click share — leaders hold, buyers still browse
Growth
Bad-18.5%90-day search growth — must beat 0% to launch
Brand share
Bad96%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, h2s monitor is a $472K/yr Amazon United States market (88K searches/yr). The top 5 brands hold 96% of demand. Verdict: Skip it — 48/100.
Data updated Jul 30, 2026 · scored weekly · How we score niches
h2s monitor market data
- Units sold / yr
- 10K–13K
- avg 500–750/product
- Revenue / yr
- $948K–$1.2M
- units × avg price
- Conversion rate
- 5.7%
- Avg BSR
- #110
- Page quality
- 0%
- Prime
- 86%
- Sponsored
- 100%
- Out of stock
- 16.7%
- Avg brand age
- 38 months
- Avg seller age
- 169 days
Competition & brand share
The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.Brands
7 rising
Sellers
44
Top-5 brand share
96%
Top 20: 100%
Top-5 click share
70%
Top 20: 100%
Open market
1%
- BW Technologies58%
- TOPTES15%
- Sooguard8%
- DANOPLUS7%
- HAOKESITE7%
- FORENSICS DETECTORS FD3%
- Open — no brand owns it (1 brand, 1%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -18.5% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Top h2s monitor search terms
- h2s monitor57K/yr
- h2s gas monitor11K/yr
- h2s12K/yr
- h2s monitor clip on8K/yr
Top h2s monitor 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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
BW Technologies Corded Electric BWC2-H BW Clip Single Gas H2S Monitor 10/15 (1 Pack)
BW Technologies$103.204.7★1,000 rev
Honeywell BW Technologies BW Clip BWC2-H Single Gas H2S Monitor
BW Technologies$119.944.4★71 rev
TopTes Guard-101 Gas Detector 4 Gas Monitor for H2S CO LEL and O2 with Vibration Visual and Audible Alarms 14h Long Battery Life Safety Explosion-Proof for Work Home - Orange
TOPTES$95.654.2★552 rev
H2S Monitor Digital H2S Monitor Clip On 0~100ppm H2S Gas Detector with Buzzer and Red Indicator Alarm LCD Backlight Hydrogen Sulfide Detector Display h2s & C/F Temperature for Various environments
DANOPLUS$45.043.9★61 rev
Sooguard H2S Monitor Clip Single Gas H2S Monitor 0~100ppm High-PrecisionH2S Gas Detector Adjustable Alarm Range 3 Alarm Modes Explosion-Proof Safety for Various Working environments (Orange)
Sooguard$54.264.7★14 rev
Newest
by launch date
H2S Monitor Clip Single Gas H2S Detector Portable Hydrogen Sulfide Detector Gas Leak Detectors with Buzzer and Red Indicator Alarm Clip on 0~100ppm H2S Gas Detector (Black)
HAOKESITE$59.086 rev
Sooguard H2S Monitor Clip Single Gas H2S Monitor 0~100ppm High-PrecisionH2S Gas Detector Adjustable Alarm Range 3 Alarm Modes Explosion-Proof Safety for Various Working environments (Orange)
Sooguard$54.2614 rev
Sooguard H2S Gas Detector Clip On Portable 0-100ppm Monitor with Triple Alarm (Sound/Light/Vibration) 0.5s Fast Response & Digital Display Personal Gas Monitor
Sooguard$53.7014 rev
TOPTES Guard-611 Portable H2S Detector Features a Convenient H2S Monitor Clip on Rechargeable with 5-Day Battery Low Battery Warning Safety Explosion-Proof-Orange
TOPTES$64.80152 rev
TopTes Guard-101 Gas Detector 4 Gas Monitor for H2S CO LEL and O2 with Vibration Visual and Audible Alarms 14h Long Battery Life Safety Explosion-Proof for Work Home - Orange
TOPTES$95.65552 rev
Trending
90-day click momentumH2S Monitor Clip Single Gas H2S Detector Portable Hydrogen Sulfide Detector Gas Leak Detectors with Buzzer and Red Indicator Alarm Clip on 0~100ppm H2S Gas Detector (Black)
HAOKESITE$59.084.5★
Sooguard H2S Monitor Clip Single Gas H2S Monitor 0~100ppm High-PrecisionH2S Gas Detector Adjustable Alarm Range 3 Alarm Modes Explosion-Proof Safety for Various Working environments (Orange)
Sooguard$54.264.7★
H2S Monitor by Forensics | USA NIST Calibration & Certificate | Dust & Explosion Proof | USB Recharge | Sound Light and Vibration Alarms | 0-100ppm H2S |
FORENSICS DETECTORS FD$96.414.0★
4 Gas Monitor Multi Gas Detector EX O2 H2S Monitor Clip on 3000mAh Rechargeable 4 Gas Meter View Records and Curve Portable 4 Gas Monitor Multi Gas Detector with Calibration Kit 4 Gas Detector
Forsensal$95.854.0★
TOPTES Guard-611 Portable H2S Detector Features a Convenient H2S Monitor Clip on Rechargeable with 5-Day Battery Low Battery Warning Safety Explosion-Proof-Orange
TOPTES$64.803.8★
What buyers say about h2s monitor
What buyers praise and complain about, mined from review topics.What buyers love
“Good product for the price”
“Work as advertised”
“Easy to use”
“It is portable”
“The unit feels well built”
“Muy buen detector”
“The unit feels lightweight”
“Works well”
“Very good tools to detect gas smell with out calling a professional”
“Good battery life”
What buyers complain about
“faulty calibration”
“didn't last”
“this monitor is junk”
“they found a leak that this did not they have a better detector”
“The alarm is loud”
“It worked once screen went dead second use was it battery issue or defective”
“$100 down the drain”
“Need better instructions on calibration”
“They both easily bumped open”
“It is a little large”
Top return reasons
Common questions
- Is h2s monitor profitable to sell on Amazon United States?
- The niche generates $472K/yr across 14 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -18.5%. Flapen's verdict: Skip it (48/100).
- How competitive is the h2s monitor niche?
- 7 brands and 44 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 96% of demand.
- What do buyers complain about in h2s monitor?
- Top complaints mined from reviews: Measurement/Reading Accuracy, Durability, Quality-Overall. The return rate is 1.7%.
- When does demand for h2s monitor peak?
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- What does it cost to enter the h2s monitor niche?
- Listings span $45.04–$222.25; the average listing price is $94.82 (sweet spot $15–$100). The average incumbent carries 228 reviews — the moat a new listing must climb.