peak flow meter
Skip itA concentrated shelf (top 5 take 91% of clicks) — this niche doesn't clear our bar today.
Quality gap
Incredible3.9★avg incumbent rating — lower means beatable quality
Avg price
Incredible$33.82avg listing price — sweet spot $15–$100
Price range
Great$12.27–$58.98cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great9.9%search→purchase rate — share of searches ending in a sale
Review moat
Great299.88avg incumbent reviews — the moat a new listing must climb
Market size
Good$397K$397K/yr · 119K searches
Returns
Okay3.3%return rate — above 6% kills the launch gate
Growth
Bad-14.0%90-day search growth — must beat 0% to launch
Competition
Bad91%top-5 click share — a locked-up shelf
Brand share
Bad97%top-5 brand share — brand-locked demand
Competition
The top 5 products capture 91% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 falling
Sellers
16
Top-5 brand share
97%
Open market
0%
- Nascool52%
- Holdly25%
- Microlife10%
- Sonmol8%
- Klanata3%
- Navnihaal3%
- Open — no brand owns it (0%)
Product shelf
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 8 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Nascool Peak Flow Meter for Adults & Kids
Nascool$29.414.4★669 rev
Mechanical Peak Flow Meter | PEF Tester - Track & Monitor Peak Expiratory Flow Changes
Holdly$19.733.9★86 rev
Sonmol Digital Peak Flow Meter PEF FEV1 Tester with Color Indicators
Sonmol$39.984.5★53 rev
Microlife (Deluxe Kit) Digital Peak Flow Meter Tests PEF / FEV1 / Early Detection of Asthma Attacks | Spirometer for Kids & Adults | Perfect for Monitoring Asthma COPD & other Lung Conditions at Home
Microlife$43.214.3★1,487 rev
Bluetooth Peak Flow Meter Digital PEF FEV1 Monitor for Asthma
Nascool$58.984.3★70 rev
Newest
by launch date
Klanata Peak Flow Meter Rotameters Plastic Plastic Tube Type Adult 100 1000L H Water Flow Meter Flowmeter Lzs 15
Klanata$12.271 rev
Mechanical Peak Flow Meter | PEF Tester - Track & Monitor Peak Expiratory Flow Changes
Holdly$19.7386 rev
Navnihaal Breath-O-Meter Peak Flow Meter White
Navnihaal$22.7926 rev
Sonmol Digital Peak Flow Meter PEF FEV1 Tester with Color Indicators
Sonmol$39.9853 rev
Bluetooth Peak Flow Meter Digital PEF FEV1 Monitor for Asthma
Nascool$58.9870 rev
Trending
90-day click momentumBluetooth Peak Flow Meter Digital PEF FEV1 Monitor for Asthma
Nascool$58.984.3★
Mechanical Peak Flow Meter | PEF Tester - Track & Monitor Peak Expiratory Flow Changes
Holdly$19.733.9★
Klanata Peak Flow Meter Rotameters Plastic Plastic Tube Type Adult 100 1000L H Water Flow Meter Flowmeter Lzs 15
Klanata$12.271.0★
Microlife Digital Peak Flow Meter Tests PEF / FEV1 / Early Detection of Asthma Attacks (Spirometer for Kids & Adults) Device for Monitoring Asthma COPD & Other Lung Conditions
Microlife$44.194.0★
Nascool Peak Flow Meter for Adults & Kids
Nascool$29.414.4★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -14.0% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Very easy to use and accurate”
“Good item, functions well”
“Works fine”
“Great value”
“It is best for people with breathing conditions like asthma”
“Durable”
“Cleaning is a breeze”
“this is the best peak flow meter”
“The device itself works good”
“Nice size”
What buyers complain about
“Breaks easily”
“It does not function properly”
“Felt cheap and did not have confidence in the results”
“Will not sync to my phone”
“The red, yellow, green marking on it in the picture is just a marking with no function”
“Also, the instructions for setting up the device don't always match the actual process”
“connection fucntion no way to place in pairing mode”
“Item does not work at all”
“NOT WORTH THE MONEY”
“I do not find it user friendly”