---
title: "H2s Monitor — $472K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/h2s-monitor"
last_updated: "2026-08-09T07:37:30.567Z"
locale: en
meta:
description: "Niche score 48/100 · $472K/yr market · 88K searches/yr · $94.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $472K/yr market · 88K searches/yr · $94.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "H2s Monitor — $472K/yr Amazon US Niche (2026) - Flapen"
---
# **h2s monitor**
**Skip it**
Brand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.
Market size 59Growth 16Conversion 64Competition 26Returns 81Price range 31Avg price 77Brand share 10Review moat 89Quality gap 73
**Review moat**
**Great****228**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Great****1.7%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$94.82**
avg listing price — sweet spot $15–$100
**Quality gap**
**Good****4.3★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Good****5.7%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****$472K**
$472K/yr · 88K searches
**Price range**
**Okay****$45.04–$222.25**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****70%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-18.5%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****96%**
top-5 brand share — brand-locked demand
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
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 ~~](https://flapen.com/research/methodology)
## **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.
4K3KSpike '25Holiday '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/h2s-monitor/trend)
## **Top h2s monitor search terms**
- **h2s monitor**57K/yr-28.7%5.7% conv. - **h2s gas monitor**11K/yr+37.9%5.8% conv. - **h2s**12K/yr-28.3%1.7% conv. - **h2s monitor clip on**8K/yr-42.8%5.9% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/h2s-monitor/search-terms)
## **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.
0%10%$47K20%$94K30%$142K40%$189K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 14 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**BW Technologies Corded Electric BWC2-H BW Clip Single Gas H2S Monitor 10/15 (1 Pack)**BW Technologies**$103.20**4.7★1,000 rev](https://www.amazon.com/dp/B00UZ1WWUK) [2**Honeywell BW Technologies BW Clip BWC2-H Single Gas H2S Monitor**BW Technologies**$119.94**4.4★71 rev](https://www.amazon.com/dp/B077WCCBRT) [3**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**$95.65**4.2★552 rev](https://www.amazon.com/dp/B0D7C8BJL1) [4**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**$45.04**3.9★61 rev](https://www.amazon.com/dp/B0BCFDP8PT) [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**$54.26**4.7★14 rev](https://www.amazon.com/dp/B0DGB48ZHZ)
**~~View all top sellers →~~**
### **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**$59.08**6 rev3mo ago](https://www.amazon.com/dp/B0GW78XMHX) [**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**$54.26**14 rev1y ago](https://www.amazon.com/dp/B0DGB48ZHZ) [**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**$53.70**14 rev1y ago](https://www.amazon.com/dp/B0DN5SYL4G) [**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**$64.80**152 rev1y ago](https://www.amazon.com/dp/B0DHGBGCM6) [**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**$95.65**552 rev1y ago](https://www.amazon.com/dp/B0D7C8BJL1)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$59.08**4.5★**▲ 253%**](https://www.amazon.com/dp/B0GW78XMHX) [**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**$54.26**4.7★**▲ 101%**](https://www.amazon.com/dp/B0DGB48ZHZ) [**H2S Monitor by Forensics | USA NIST Calibration & Certificate | Dust & Explosion Proof | USB Recharge | Sound Light and Vibration Alarms | 0-100ppm H2S |**FORENSICS DETECTORS FD**$96.41**4.0★**▲ 57%**](https://www.amazon.com/dp/B07GF7XK2D) [**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**$95.85**4.0★**▲ 54%**](https://www.amazon.com/dp/B0D73D8BJL) [**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**$64.80**3.8★**▲ 28%**](https://www.amazon.com/dp/B0DHGBGCM6)
**~~View all trending →~~**
## **What buyers say about h2s monitor**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**12%
*“Good product for the price”*
**Advertised Vs Actual Product**12%
*“Work as advertised”*
**Ease Of Use**9%
*“Easy to use”*
**Portability**8%
*“It is portable”*
**Quality-Overall**7%
*“The unit feels well built”*
**Sensor**7%
*“Muy buen detector”*
**Weight Light**5%
*“The unit feels lightweight”*
**Efficiency**5%
*“Works well”*
**Smell**5%
*“Very good tools to detect gas smell with out calling a professional”*
**Battery Life**4%
*“Good battery life”*
### **What buyers complain about **
**Measurement/Reading Accuracy**19%
*“faulty calibration”*
**Durability**8%
*“didn't last”*
**Quality-Overall**8%
*“this monitor is junk”*
**Leak-Proof**8%
*“they found a leak that this did not they have a better detector”*
**Noise Level**7%
*“The alarm is loud”*
**Battery Life**5%
*“It worked once screen went dead second use was it battery issue or defective”*
**Value For Money**4%
*“$100 down the drain”*
**Instructions/User Manual/Troubleshooting**3%
*“Need better instructions on calibration”*
**Ease Of Use**3%
*“They both easily bumped open”*
**Size-Overall**3%
*“It is a little large”*
### **Top return reasons **
**Functionality-Overall**29%
**Measurement/Reading Accuracy**10%
**Alarm/Timer Accuracy**10%
**Advertised Vs Actual Product**7%
**Certifications**6%
**Battery Life**6%
**Compatibility-Overall**4%
**Value For Money**4%
**Size-Overall**4%
**Defective Material/Parts**3%
## **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.
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