Best Aquarium Hydrometers (Aug. 2022) - Rated by CherryPicks' Experts

At a Glance: Our Top Picks

Top 1

Coralife Energy Savers ACLAF877 Deep Six Hydrometer

9.8
CPR Score
Top 2

Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT...

9.7
CPR Score
Top 3

Hikari AccuProbe Aquarium Hydrometer, Full

9.6
CPR Score
Tips

We researched and analyzed dozens of Aquarium Hydrometers products from different Fish & Aquatic Pets brands, including Fluval, Hikari, capetsma, AUTOUTLET, Instant Ocean, boxtech, POPETPOP, Sera, Gain Express, aichose, SOONHUA, Coralife, TOPINCN, NUOBESTY, Kent Marine, Petyoung, V·RESOURCING, Marine Color, ZRM&E, KOOBOOK, MY MIRONEY, Ade Advanced Optics, ISTA, CORISRX BEST OF YOUR LIFESTYLE, Actopus, Semetall, Yosoo123, Jiameajani, Agriculture Solutions, RZ, CIZTADA, Hallocool And QIANJINL. We've selected 30 best Aquarium Hydrometers in the following ranking by considering price, product features, easy to use and so on.

* Cherrypicksreviews.com is reader-supported, Our editor review, and recommend the best products based on extensive data analysis, if you click on the product links, we may earn a commission through qualifying products purchased.

The Best Aquarium Hydrometers Rated by CherryPicks

Show More

Top 30 Aquarium Hydrometers on Aamazon (Verified You can Buy)

Top 1

Coralife Energy Savers ACLAF877 Deep Six Hydrometer

Coralife
100108103
5.5 x 1.0 x 8.7 Inches
0.2 pounds

Ratings for Coralife (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Coralife is one of the market’s leading manufacturers of premium aquarium products.
Coralife's Hydrometer takes a true water sample at six inch depth.
Show More
Top 2

Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation

Agriculture Solutions
WL0020-ATC
2.0 x 3.0 x 8.0 Inches
0.55 Pounds

Ratings for Agriculture Solutions (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
TOOLBOX -

Features

Measure salt water or salinity of water, ideal for aquariums and marine monitoring.
Measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand.
Show More
Top 3

Hikari AccuProbe Aquarium Hydrometer, Full

Hikari
96010
11.0 x 1.0 x 4.0 Inches
0.2 Pounds

Ratings for Hikari (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Sparkfish 474
Best WH 2,063
Gingerbread Tropical Fish & Coral 4,634

Features

"Dry Hands" design avoids contamination of aquarium or water sample
Accurate to 0.001 specific gravity and salinity (PPT) measurements
Show More
Top 4

ZRM&E Seawater Hydrometer for Aquarium Aquaculture Seawater Densimeter Ocean Hydrometer Salinity Meter for Fish Tank Salinity Specific Gravity Test

ZRM&E

Ratings for ZRM&E (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DGHP -

Features

Made of high quality plastic, aquarium transparent, automatic accurate reading brine hydrometer
Accurate, durable and easy to read salt and specific gravity of your marine aquarium, small and waterproof. If the specific gravity is between 1.000-1.019, it indicates that the specific gravity is low; if the specific gravity is between 1.020-1.023, it indicates that the specific gravity is normal; if the specific gravity is between 1.024-1.030, it indicates that the specific gravity is high
Show More
Top 5

boxtech Aquarium Marine Test, Sea Saltwater Hydrometer, Reef Ocean Hydrometer Salinity Meter for Pool Aquarium Water Salinity Specific Gravity Test

boxtech
5.1181 x 9.0551 x 0.9843 Inches

Ratings for boxtech (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Box&Water -

Features

🐠 Safe Material & Unique Design: Made of durable Acrylic, this Fish Tank Test Kit salinity Hydrometer is designed with an automatic level function
🐠 Quickly, easily, and accurately measurement: With this hydrometer saltwater aquarium test kit, you can test your marine aquarium's salt level and specific gravity, and It is optimum to be put into below 6" deep water to avoid the error caused by the oil film on the water
Show More
Top 6

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

AUTOUTLET
8541957195
7.874 x 3.5433 x 2.3622 Inches
0.53 Pounds

Ratings for AUTOUTLET (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
AUTOUTLET -

Features

【AUTOUTLET Salinity Refractometer】This salinity tester is used to measure salinity of brine/seawater, monitor and control the concentration of saltwater. Ideal for aquariums and marine applications.
【Measures on 2 Scales】This saltwater hydrometer measures on dual scales: specific gravity and salinity. Ideal for aquariums, marine monitoring, agriculture, gardening and educational purposes.
Show More
Top 7

capetsma Salinity Tester, Accurate Sea Hydrometer Aquarium Marine Salinity Meter for Fish Tank Pond Water Saltwater Freshwater Specific Gravity Test

capetsma

Ratings for capetsma (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
capetsma 10,000

Features

🐠 Safe Material & Unique Design: Made of durable Acrylic, this Fish Tank Test Kit salinity Hydrometer is designed with an automatic level function.
🐠 Quickly, easily, and accurately measurement: With this hydrometer saltwater aquarium test kit, you can test your marine aquarium's salt level and specific gravity, and It is optimum to be put into below 6" deep water to avoid the error caused by the oil film on the water.
Show More
Top 8

Seawater Salinity Refractometer,V-Resourcing Automatic Temperature Compensation Sea Water Salinity Measurer for Aquarium, Hydrometer, 0-100ppt & 1.000-1.070 Salinity Specific Gravity

V·RESOURCING
COMINHKPR127692
8.0 x 3.0 x 2.0 Inches

Ratings for V·RESOURCING (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
V-Resourcing -

Features

Automatic Temperature Compensation: 10℃~30℃
Measuring range: salinity: 0-100 ‰, Specific Gravity : 1.000 to 1.070
Show More
Top 9

RZ Aquariums Salinity Refractometer for Seawater Marine Fish-Keeping, Dual Scales Specific Gravity Salinity Meter Hydrometer 0-100ppt & 1.000-1.070, Saltwater Tester with ATC Function

RZ

Ratings for RZ (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
XRC Electronics -
Top 10

Aquarium Salinity Refractometer with ATC Function,Saltwater Test Kit for Seawater, Pool, Aquarium, Fish Tank.Dual Scale: Specific Gravity & Salt Percent

aichose
8541957181
7.0 x 1.5 x 1.5 Inches
0.23 Pounds

Ratings for aichose (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Top Town -

Features

DESIGNED FOR - testing the concentration of saltwater, help you to monitor and control the concentration of salt water.
WIDELY USE - Can be used for Aquariums, Marine Monitoring, Agricultural, Gardening & Educational Purposes.
Show More
Top 11

Aquarium Equip UP Glass Saltwater Hydrometer - Reef Soft Coral Salinity Marine Fish Shrimp sea

CORISRX BEST OF YOUR LIFESTYLE
D667 UP???????
0.8 x 0.8 x 6.2 Inches
0.0188 Pounds

Ratings for CORISRX BEST OF YOUR LIFESTYLE (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Relaxbuty -

Features

1. Easy to use 2. Green indicators are ideal range of water temperature and specific gravity for most salt water / marine aquariums 3. Hydrometer measures specific gravity 4. Need it for raising brine shrimp
Top 12

Yosoo123 Accurate Automatic Hydrometer SaltSalinity Meter Salinimeter for Fish Tank (Square Type)

Yosoo123
Yosoo537gtqix12
5.5118 x 3.5433 x 0.7874 Inches
0.2021 Pounds

Ratings for Yosoo123 (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Yasashi11 -

Features

Insert the gravity into the tank or the fish pond below 15 cm until thespills the plate. (slowly fillingto prevent bubbles attached to the pointer)
When thereaches the full state (and the top level of the baffle), take out the hydrometer and place it on a horizontal surface.
Show More
Top 13

Salinity Refractometer for Aquarium, Marine Monitoring, Saltwater Testing, Dual Scale Salinity Tester 0-100 PPT& 1.000-1.070 Specific Gravity Saline Seawater Refractometer Hydrometer with ATC

Hallocool

Ratings for Hallocool (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Hallocool -

Features

DUAL SCALES - Saltwater Refractometer measures on specific gravity (D20/20) 1.000-1.070 and parts per thousand 0~100‰, you can get the result in two different units by one test
WIDELY USE - The Refractometer designed for Aquariums, Marine Monitoring, Agricultural and Educational Purposes. Help you to control concentration of salt water easily
Show More
Top 14

MY MIRONEY 2-Pack Salinity Tester Sea Hydrometer Salinity Meter Specific Gravity Test for Aquarium Fish Tank Water Marine Saltwater

MY MIRONEY
AMT12052342

Ratings for MY MIRONEY (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
MTME -

Features

If the specific gravity between 1.020-1.023,show that the specific gravity is nomal.
Designed with an automatic level function,can automatically identify the level to avoid errors.
Show More
Top 15

Semetall Salinity Tester Transparent Acrylic Aquarium Sea Hydrometer Salinity Meter Salinity Specific Gravity Test for Fish Tank Pond Water Saltwater Freshwater

Semetall

Ratings for Semetall (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Lewei Electric -

Features

【🐟 SPECIFICATION】The reading is temperature-corrected and accurate to +/-0.001. The unit of specific gravity is 1. 000-1. 030 (ppt value: 0-40 degrees), the safe area is 1.020-1.023 (ppt value: 27-31 degrees), and the low specific gravity area is 1.000-1.019 (ppt value: 0- 26 degrees), the higher specific gravity area is 1.024-1.030 (ppt value: 32-40 degrees). (Note: PPT value indicates salinity in the outer range of the scale)
【🐟 MATERIAL】The salinity tester is made of transparent acrylic material, which is relatively hard and easy to read the salt and specific gravity of your marine aquarium.
Show More
Top 16

Sera Marin Hydrometer

Sera
8910
1.18 x 1.38 x 7.48 Inches
0.08 Pounds

Ratings for Sera (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Country Of Origin : China
The Package Height Of The Product Is 7.48 Inches
Show More
Top 17

Actopus Hydrometer Salinity Tester for Aquarium Sea Fish Tank Salt Water

Actopus

Ratings for Actopus (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Actopus -

Features

Quick measurement on salt level, specific gravity.
Rinse with fresh water after use
Show More
Top 18

KOOBOOK 1 Pcs Accurate Hydrometer Salinity Meter 1.000-1.027 Salinity Range 0-36 for Aquarium Fish Tank Marine Sea Saltwater

KOOBOOK

Ratings for KOOBOOK (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
WenLiJun -

Features

Made of high quality plastic, Withstand voltage,high transparency.
Special for culture of marine fish, the specific gravity and salinity of seawater are displayed once, easy to use and easy to read.
Show More
Top 19

QIANJINL Salinity Meter Aquarium Hydrometers Salinity Tester Hydrometer Saltwater Aquarium Pool Fish Tank Water Tester Sea Water Salinity Specific Gravity Test(Rectangle)

QIANJINL

Ratings for QIANJINL (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
chenjiawang -

Features

▶Material: The salinity tester is made of plastic, transparent, robust and durable structure.
▶Simple to use:Keep your hands clean, insert the hydrometer into the water tank or fish pond 15 cm (6 inches) below, avoid air bubbles adhering to the hydrometer during the test.
Show More
Top 20

ISTA Saltwater Hydrometer - Aquarium Fish Tank Reef Soft Coral Marine Supplies

ISTA
I-808
5.28 x 4.33 x 0.71 Inches
0.18 Pounds

Ratings for ISTA (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Big Als -

Features

●Provide precise salinity reading. ●Easy in operation and salinity reading. ●Smooth water flow design prevents the attachment of fine bubbles to increase measurement accuracy.
Item Package Height: 1.8
Show More
Top 21

POPETPOP Aquarium Fish Tank Glass Hydrometer: High Precision Salinity Hydrometer Glass Salimeter Sea Water Densitometer for Aquarium

POPETPOP
9AZ5499PAARRJ17RM
11.0236 x 0.7874 x 0.7874 Inches
0.1543 Pounds

Ratings for POPETPOP (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Dorothear -

Features

After use, soak this saltwater meter in mild acid ( vinegar ) for 30 minutes, rinse with tap water and air dry.
Made of glass materials, safe and durable, with excellent texture.
Show More
Top 22

TOPINCN Saltwater Hydrometer Salt Water Salinity Meter Accurate Automatic Hydrometer Salt Water Salinity Meter for Fish Tank

TOPINCN
5.5118 x 3.5433 x 0.7874 Inches

Ratings for TOPINCN (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Minnya -

Features

Accurate, durable, and easy to read sea water hydrometer
This product is designed with an automatic level function, can automatically identify the level to avoid errors
Show More
Top 23

NUOBESTY Aquarium Salinity Meter Sea Saltwater Hydrometer Aquarium Liquid Meter Aquarium Aquarium Supplies

NUOBESTY
R15056O13UDXPT
11.0236 x 0.7874 x 0.7874 Inches
0.1543 Pounds

Ratings for NUOBESTY (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Scotebias -

Features

In aquariums, convenient to measure the gravity of seawater and raise fish.
easy to use, suitable for fish tanks and aquariums.
Show More
Top 24

Ade Advanced Optics aaosal Professional Automatic Temperature Compensation Sea Water Salinity Refractometer for Aquarium, Hydrometer, 0-100 ppt and 1.000-1.070 Salinity S.G.

Ade Advanced Optics
aaosal
0.0438 Pounds

Ratings for Ade Advanced Optics (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
sportswarehouse -

Features

Local stock for fast shipment
Resale quality - 50 percent heavier than the soft case cheap units
Show More
Top 25

Pen Type Salinity & Temperature Meter ATC NaCl Salt Water Quality Tester for Saltwater Aquarium Hydroponics Food

Gain Express
837-2

Ratings for Gain Express (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Gain Express -

Features

MEASURING RANGE: 0~9999 ppm or 10.0ppt~100.0ppt or 0.0%~10.0% or 0.950~1.080 (S.G.) based on NaCl with ±%F.S ±1 digit / ±0.5°C Accuracy
DISPLAY: Dual Temperature and Salinity in four measurement units (ppm, ppt, %, S.G) / 30 x 18mm LCD Size
Show More
Top 26

Digital Salinity Tester for Salt Water - Aquarium Salinity Meter with ATC, IP67 Waterproof, 0-200 PPT Large Range Multi-Parameter Tester for Seawater, Fish Tank, Hydroponics

CIZTADA
LD-203

Ratings for CIZTADA (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
CIZTADA-US -

Features

[Large Salinity Range] Ciztada salinity tester has 2 measurement modes, scale range: 0~9999 ppm/10.0~200 ppt and 0.00-25.00%, which is 2 times than the salinity refractometer
[Automatic Temperature Compensation] Notice: We recommend waiting for a while to observe the measurement results for more accurate reading. Ciztada salinity tester is equipped with ATC part inside, during normal temperature, once calibrated, the temperature change would never affect the accurate of your measuring result.
Show More
Top 27

Petyoung Aquarium salinimeter Sea Saltwater Hydrometer Fish Tank Salinimeter Salt Water Salinity Meter Water Salinity Specific Gravity Test

Petyoung
1617891/120966AM131US3ASD
0.194 Pounds

Ratings for Petyoung (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Wolyer -

Features

Fit for brackish and marine aquariums. Perfect for testing both salinity and specific gravity of your brackish and marine tanks.
Very accurate measurement readings, please rest assured to purchase
Show More
Top 28

Kent Marine 02120 Hydrometer

Kent Marine
100102120
4.5 x 6.4 x 0.6 Inches
0.0001 Pounds

Ratings for Kent Marine (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
my Goods 1,279
Pet Stuff Now -

Features

Large numeric display includes sweet spot for marine and reef aquariums
Water is gently diverted to bottom, reducing air bubbles from forming
Show More
Top 29

Automatic Temperature Compensation Sea Water Salt Salinity Refractometer for Aquarium, 0% - 10% & 1.0 to 1.070 S.g. Dual Scale Hydrometer By Adeadvancedoptics

Ade Advanced Optics
Salinity10
8.7 x 2.8 x 1.42 Inches
0.4 Pounds

Ratings for Ade Advanced Optics (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
sportswarehouse -

Features

Quick Results (Faster Than Your Homebrew Hydrometer)
Easy and simple to use. More Accurate Than Your Homebrew Hydrometer
Show More
Top 30

SOONHUA Sea Saltwater Hydrometer Aquarium Salinimeter Salt Water Salinity Meter Water Salinity Specific Gravity Test

SOONHUA
1617891-AM85-2021-FBM
0.194 Pounds

Ratings for SOONHUA (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
SOONHUA Store -

Features

Accurate, durable, and easy to read sea water hydrometer
This product is designed with an automatic level function, can automatically identify the level to avoid errors
Show More

Top 10 Aquarium Hydrometers - Verified to Buy (New July 2022)

Top 10 Aquarium Hydrometers Brands on Amazon

Here is the list of top rated brands that evaluated by CherryPicks.

  • Coralife
  • Agriculture Solutions
  • Hikari
  • ZRM&E
  • boxtech
  • AUTOUTLET
  • capetsma
  • V·RESOURCING
  • RZ
  • aichose

Top 10 Aquarium Hydrometers Sellers: CPR Seller Rank List

CPR sellers rank is based on CherryPicks-AI bestselling ranking system that helps us analyze each seller's sales trends. The List of top seller ranks is our in-house data, essential for our product ranking to help you make the right shopping choice.

Rank Name Yearly Feedbacks Avg. Ratings
🥇 Sparkfish 4,550 4.9
🥈 LET'S BUY 4,336 4.8
🥉 my Goods 2,581 4.8
4 Kens Fish 646 4.8
5 MTME 415 4.8
6 Amazon.com 386 4.7
7 sportswarehouse 378 4.7
8 capetsma 356 4.9
9 Box&Water 231 4.8
10 Gain Express 218 4.9
View or download top Aquarium Hydrometers seller & rating report
Sparkfish [4550] LET'S BUY [4336] my Goods [2581] Kens Fish [646] MTME [415] Amazon.com [386] sportswarehouse [378] capetsma [356] Box&Water [231] Gain Express [218] Sparkfish 32% LET'S BUY 31% my Goods 18% Kens Fish 5% MTME 3% Amazon.com 3% sportswarehouse 3% capetsma 3% Box&Water 2% Gain Express 2%

Why Should You Trust Us?

Now hundreds and thousands of Fish & Aquatic Pets supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best Aquarium Hydrometers to buy in 2022?

CherryPicks’s Methodology for Evaluating Aquarium Hydrometers

We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Fish & Aquatic Pets items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.

We collected and analyzed 652 of Aquarium Hydrometers products based on our selection criteria. It helped us shortlist the top qualified and rated Aquarium Hydrometers for Fish & Aquatic Pets, We found that most customers choose Aquarium Hydrometers with an average price of $14.80, and the top brands are Fluval, Hikari, capetsma, AUTOUTLET, Instant Ocean, boxtech, POPETPOP, Sera, Gain Express, aichose, SOONHUA, Coralife, TOPINCN, NUOBESTY, Kent Marine, Petyoung, V·RESOURCING, Marine Color, ZRM&E, KOOBOOK, MY MIRONEY, Ade Advanced Optics, ISTA, CORISRX BEST OF YOUR LIFESTYLE, Actopus, Semetall, Yosoo123, Jiameajani, Agriculture Solutions, RZ, CIZTADA, Hallocool And QIANJINL. 

Then our expert-level editors reviewed all those quality items and selected the top 30 Aquarium Hydrometers for you, We have researched hundreds of sellers and picked the top sellers for Fish & Aquatic Pets, including Sparkfish, LET'S BUY, my Goods, Kens Fish, MTME, Amazon.com, sportswarehouse, capetsma, Box&Water, Gain Express, Top Town And Scotebias. The Coralife Energy Savers ACLAF877 Deep Six Hydrom... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 1,131 consumers with an average rating of 4.3.

We've helped a lot of satisfied users get the right Pet Supplies product based on their needs, and save lots of time for them to pick Aquarium Hydrometers to buy.


Written By Martin Simon

Martin J. Simon is a pet lover, an environmental advocate, and a skilled writer who has an interest in writing about appliances. He loves to tinker with new appliances, put them through stress tests and see how far they can be pushed beyond their limits.