Refractometer Saltwater Aquarium
FailThe top 5 products take 93% of clicks, so Refractometer Saltwater Aquarium is a Fail.
- Flapen Score
- 39 / 100Ranks 3,439 of 3,978 Pet Supplies niches · −12 vs the category median of 5139
- Market size
- $54K/yr24K searches / yr
- 90-day growth
- -11.3%search demand this quarter
- Competition
- 93%top-5 click share · 7 brands · 10 sellers
Flapen Score
Refractometer Saltwater Aquarium against its category
The dotted line is the Pet Supplies average. Past it, Refractometer Saltwater Aquarium is stronger. Inside it, weaker.
Market
The Refractometer Saltwater Aquarium market on Amazon at a glance
Shoppers on Amazon United States searched for Refractometer Saltwater Aquarium 24K times last year and spent an estimated $54K. The top 5 brands take 93% of clicks. Demand peaks in Jan–Aug–Sep. Flapen scores it 39 out of 100, a Fail.
01 · Demand
An estimated 11.1% of those searches ended in a purchase.
Shoppers searched for this 24K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 11.1% of those searches ended in a purchase. Searches in the last 90 days moved -11.3% against the 90 days before. Searches, conversion and average price together put the market at an estimated $54K a year.
- Searches, last 12 months
- 24K
- Growth, 90 days vs prior 90
- -11.3%
- Conversion, latest week
- 11.1%
- Market size, estimated
- $54Ka year
- Peak month
- August2.4× the quietest month
- Top search term
- refractometer saltwater aquarium18K searches a year
02 · Price
A sale here is worth $20.49.
Listings sell for $20.49 on average, from $13.37 to $48.86. Amazon reports units sold in ranges. This niche sold 3K to 3K a year. The average listing sells 250 to 500 of them. At $20.49 that is $5K to $10K a year per listing.
- Average price
- $20.49inside the $15 to $100 sweet spot
- Price range
- $13.37–$48.86
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 3K–3K
- Units per listing a year
- 250–500
- Revenue per listing a year
- $5K–$10K
- Returns
- 2.9%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
86% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 2.6% of listings are out of stock. The average listing ranks #23 within Fish & Aquatic Pets. It carries 1,248 reviews at 4.44 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 86%
- Prime listings
- 100%
- Out of stock, average day
- 2.6%
- Average rank
- #23in Fish & Aquatic Pets
- Average rating
- 4.44 starsAmazon United States average 4.42 stars
- Average reviews
- 1,248per listing
- Listings tracked
- 7
04 · Newcomers
Brands here are established.
The brands on the shelf have sold for 68 months on average, so the names here are established.
- Launched, last 12 months
- 0
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 68 months
Products
Top Refractometer Saltwater Aquarium products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 17, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Agriculture Solutions Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation
- Price
- $17.94
- Rating
- 4.6/5
- Reviews
- 4,821
- Age
- 10y ago

Salinity Refractometer for Aquarium Seawater Marine Fishkeeping Salinity Tester 0-100PPT & 1.000-1.070 Salinity Hydrometer Slatwater Refractometer with Automatic Temperature Compensation (ATC)
- Price
- $16.25
- Rating
- 4.5/5
- Reviews
- 581
- Age
- 5y ago

SunGrow Measure Salinity of Water with Aquarium Refractometer Remarkable Accuracy Easy Reading
- Price
- $13.37
- Rating
- 4.5/5
- Reviews
- 580
- Age
- 8y ago

Digital Salinity Meter 3-in-1 Saltwater Tester Specific Gravity Salinity & Temperature Pen Hydrometer High Accuracy Water Quality Tester for Aquarium Marine Pool Hydroponics Aquaculture
- Price
- $48.86
- Rating
- 4.1/5
- Reviews
- 91
- Age
- 4y ago

AUTOUTLET Refractometer Saltwater Aquarium for Seawater Pool Tank Testing Marine Fishkeeping 0-100PPT & 1.000-1.070 Salinity Tester with ATC Function Hydrometer Specific Gravity Salinity Meter Kit
- Price
- $15.99
- Rating
- 4.6/5
- Reviews
- 2,349
- Age
- 8y ago
Trending
estimated 90-day click momentum
Digital Salinity Meter 3-in-1 Saltwater Tester Specific Gravity Salinity & Temperature Pen Hydrometer High Accuracy Water Quality Tester for Aquarium Marine Pool Hydroponics Aquaculture
- Price
- $48.86
- Rating
- 4.1/5
- Reviews
- 91
- Age
- 4y ago

Salinity Refractometer for Aquarium Seawater Marine Fishkeeping Salinity Tester 0-100PPT & 1.000-1.070 Salinity Hydrometer Slatwater Refractometer with Automatic Temperature Compensation (ATC)
- Price
- $16.25
- Rating
- 4.5/5
- Reviews
- 581
- Age
- 5y ago

SunGrow Measure Salinity of Water with Aquarium Refractometer Remarkable Accuracy Easy Reading
- Price
- $13.37
- Rating
- 4.5/5
- Reviews
- 580
- Age
- 8y ago

Seawater Salinity Refractometer Automatic Temperature Compensation Seawater Salinity Hydrometer 0-100ppt & 1.000-1.070 Salinity Specific Gravity Tester for Aquarium Pool Tank Marine Fishkeeping
- Price
- $15.27
- Rating
- 4.4/5
- Reviews
- 225
- Age
- 9y ago

Agriculture Solutions Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation
- Price
- $17.94
- Rating
- 4.6/5
- Reviews
- 4,821
- Age
- 10y ago
Newest
by launch date
Professional Salinity Refractometer Salinity Tester Salt Tester for Saltwater Pool for Saltwater Aquarium Pools and Tanks Dual Scale 0-100 PPT & Specific Gravity 1.000-1.070 with ATC Function
- Price
- $15.78
- Rating
- 4.4/5
- Reviews
- 88
- Age
- 3y ago

Digital Salinity Meter 3-in-1 Saltwater Tester Specific Gravity Salinity & Temperature Pen Hydrometer High Accuracy Water Quality Tester for Aquarium Marine Pool Hydroponics Aquaculture
- Price
- $48.86
- Rating
- 4.1/5
- Reviews
- 91
- Age
- 4y ago

Salinity Refractometer for Aquarium Seawater Marine Fishkeeping Salinity Tester 0-100PPT & 1.000-1.070 Salinity Hydrometer Slatwater Refractometer with Automatic Temperature Compensation (ATC)
- Price
- $16.25
- Rating
- 4.5/5
- Reviews
- 581
- Age
- 5y ago

AUTOUTLET Refractometer Saltwater Aquarium for Seawater Pool Tank Testing Marine Fishkeeping 0-100PPT & 1.000-1.070 Salinity Tester with ATC Function Hydrometer Specific Gravity Salinity Meter Kit
- Price
- $15.99
- Rating
- 4.6/5
- Reviews
- 2,349
- Age
- 8y ago

SunGrow Measure Salinity of Water with Aquarium Refractometer Remarkable Accuracy Easy Reading
- Price
- $13.37
- Rating
- 4.5/5
- Reviews
- 580
- Age
- 8y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 93% of clicks. A locked shelf that new listings rarely crack.
Brands
7 flat
Sellers
10
Est. top-5 brand share
93%
Top 20: 100%
Est. top-5 click share
93%
Top 20: 100%
Open market
3%
- Agriculture Solutions60%
- Hallocool15%
- SunGrow8%
- Anbachi7%
- AUTOUTLET4%
- TOOGOND3%
- Open — no brand owns it (1 brand, 3%)
Demand
Refractometer Saltwater Aquarium search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Jan, Aug, Sep · busiest ÷ quietest = 2.4×
Reviews and returns
What reviews say buyers love and hate about Refractometer Saltwater Aquarium
We read the reviews and the return reasons for every product selling here.
“Did not work at all”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Refractometer Saltwater Aquarium questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









