Editor's Choice - Our Favorite aichose Aquarium Hydrometers

1. Aichose Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium, Saltwater Pool, with AT...

User Ratings: 71

aichose SR0024BE First Impressions

"Easy to use."

I use this for my 10g brackish and it works ok. I was surprise that the product was really cheap compare to the other ones. Make sure to knock out the bubbles on the white dial by hitting it with your knuckle. 010; I can easily read this off of the refractometer. I have a 2000+ gallon pond and I just put salt in it last month. I have a 2000+ gallon pond and I just put salt in it last month. It did not need adjusting to calibrate, though I tried to just to see how it worked.

  • Aichose Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium, Saltwater Pool, with ATC Function, Dual Scale: Salinity 0-100‰ and Corresponding Specific Gravity
  • It is designed for the measurement of seawater or low concentrated saltwater.
  • Dual scale: 0-100‰ salinity and corresponding specific gravity 1.000-1.070
  • Automatic temperature compensation function minimizes the effect of the temperature on testing result.
  • Easy to Use: It's very easy to use even for new users. And no battery needed.
  • Ideal for marine fishkeeping aquarium, saltwater pool, marine monitoring,lab,agricultural, gardening and educational purposes.
  • Manufacture: XDC Co,.Ltd.
  • Editor's Impressions Of The aichose SR0024BE
  • Accuracy [star rating='4.4']
  • Quality [star rating='5']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.3']

aichose SR0024BE Final Thoughts

"Gave me confidence."

I would like to provide a great marine environment for sea-fishes. It's perfectly accurate based on the known calibration fluid. I would suggest purchasing the salt calibration solution. Great little device to check your salt water levels in the swimming pool or spa. A hydrometer for making sure you have the right saltwater mix. I would like to provide a great marine environment for sea-fishes. I bought this and a hydrometer because of the reviews saying its not accurate.

Overall Score
4.5

[star rating="4.5"]
(37 Points)

2. Coralife Energy Savers ACLAF877 Deep Six Hydrometer

User Ratings: 67 7

Coralife 100108103 First Impressions

"024 and my refracto read."

I found mine was calibrated out of the box. At first, I was getting bubbles sticking to the rotating arrow. Wipe down glass surface to dry it and put it back on the shelf til next time. So once your instant ocean shows a measurement. Does just as good of a job of any meter you would buy at the store! I tried it over and over and no bubbles! Simple to use, but if there are any air bubbles the results will be way off.

  • Coralife Energy Savers ACLAF877 Deep Six Hydrometer
  • Included components: All Components included in Picture and Description
  • Cora life is one of the markets leading manufacturers of premium aquarium products
  • Cora life's Hydrometer takes a true water sample at six inch depth
  • Easy to read and accurate, this specific gravity meter is designed to give temperature-corrected readings in warm water aquariums
  • 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
  • Specific Gravity and Salinity PPT Scales
  • Optimal Specific Gravity / Salinity range indicator on scale
  • Manufacture: Central Garden & Pet
  • Product Dimensions: 6.69 x 0.79 x 4.72 inches; 3.2 Ounces
  • Editor's Impressions Of The Coralife 100108103
  • Accuracy [star rating='4.8']
  • Quality [star rating='5']
  • Value For Money [star rating='4.8']
  • Affordability [star rating='4.4']

Coralife 100108103 Final Thoughts

"Easy instructions."

I couldn't decide between this and one of the float arm meters or both. Once I figured that out, it works great. Now its easy to make sure I have the correct amount of salt in my aquariums. I use this for my 10g brackish and it works ok. My only criticism would be that it's a little too dark. I will update later to see if the refractor will keep its calibration. The instant ocean hydrometer will always be right.

Overall Score
4.3

[star rating="4.3"]
(543 Points)

3. Pen Type Salinity & Temperature Meter ATC NaCl Salt Water Quality Tester for Saltwater Aquarium Hydr...

User Ratings: 49 17

Gain Express 837-2 First Impressions

"Easy to calibrate."

Just rinse with warm water afterwards. I run brackish tanks and it works perfectly. Hate the batteries, but once loaded, it seems to work fine. I tried it over and over and no bubbles! Excellent piece of equipment for the price. The water was at what I expected it should be. 026 and the tank isn't, new animals will go into shock.

  • Pen Type Salinity & Temperature Meter ATC NaCl Salt Water Quality Tester for Saltwater Aquarium Hydroponics Food
  • 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
  • APPLICATION: Salinity measurement in fish pond, tank, aquariums, laboratories, food processing, hydroponics, Aquaculture, and other water monitoring facilities.
  • FEATURES: Waterproof IP65 / One touch calibration / Auto power off and Non-Sleep mode disable / Multi points calibration
  • POWER SUPPLY / SENSOR : 4 x LR44 button batteries
  • User friendly easy to operate with One-touch calibration
  • Manufacture: Gain Express Holdings Ltd
  • Batteries: 4 LR44 batteries required.
  • Editor's Impressions Of The Gain Express 837-2
  • Accuracy [star rating='3.2']
  • Quality [star rating='4.1']
  • Value For Money [star rating='3.2']
  • Affordability [star rating='3.8']

Gain Express 837-2 Final Thoughts

"So, it does seem to work."

But with alittle persistance I am able to read it. Perfrct for someone learning or anyone for that matter. Once I adjusted the refractometer, my aquarium salinity read 1. Works great,& comes in a storage box. Works well on my Saltwater Aquarium. It did not need adjusting to calibrate, though I tried to just to see how it worked. Would be nice if stem were slightly larger for easier read.

Overall Score
3.8

[star rating="3.8"]
(99 Points)

4. Aeroway Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.)

User Ratings: 79 3

Aeroway 8541957182 First Impressions

"021 the other read."

Make sure to knock out the bubbles on the white dial by hitting it with your knuckle. Normally that gives the more accurate reading. I will get one later but for now this will do, since im just starting. I run brackish tanks and it works perfectly. I strongly recommend a refractometer vs. This device is a godsend and so much easier and cleaner to use. On the shaft of the refractometer, there's a little, rubber-covered nub.

  • Aeroway Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.)
  • Measure salt water or salinity of water, ideal for aquariums and marine monitoring.
  • Features automatic temperature compensation (ATC),The main part is made of chromium, it's very durable.
  • Measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand (‰).
  • Comes with hard case, dropper, screwdriver and cleaning cloth.
  • We offer premium quality and the best service, no matter what reason cause dissatisfaction,just return it within 30 days for a full refund. No questions asked, no hassle.
  • Manufacture: Aeroway
  • Editor's Impressions Of The Aeroway 8541957182
  • Accuracy [star rating='3.7']
  • Quality [star rating='4.2']
  • Value For Money [star rating='4.9']
  • Affordability [star rating='4.7']

Aeroway 8541957182 Final Thoughts

"Works great!"

Simple to use, but if there are any air bubbles the results will be way off. I compared the readings using this hygrometer and the calibrated refractometer. Normally that gives the more accurate reading. It's a basic but reliable refractomer I use it for my aquariums. Every time I leave to do something I come back and it's at the bottom of my tank. I bought this and a hydrometer because of the reviews saying its not accurate. So worth it considering its great quality and great price.

Overall Score
4.6

[star rating="4.6"]
(43 Points)

5. Sera Marin Hydrometer

User Ratings: 51 7

Sera 8910 First Impressions

"Easy to calibrate."

He is too cute not to want to take care of properly. My only criticism would be that it's a little too dark. I have to recalibrate it ever use though which worries me sometimes. Too that makes it appear too cheap. I have tried others before but this has given me accurate and stable results. The water was at what I expected it should be. This requires repeatedly tapping the arm with a pencil.

  • Sera Marin Hydrometer
  • Country Of Origin : China
  • The Package Height Of The Product Is 7.48 Inches
  • The Package Length Of The Product Is 2 Inches
  • The Package Width Of The Product Is 1.38 Inches
  • Manufacture: Sera North America, Inc.
  • Product Dimensions: 1.18 x 1.38 x 7.48 inches; 1.28 Ounces
  • Editor's Impressions Of The Sera 8910
  • Accuracy [star rating='5']
  • Quality [star rating='4.6']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='3.8']

Sera 8910 Final Thoughts

"I highly recommend!"

The refractor was off out off the box. Pretty darn accurate for the price. It's perfectly accurate based on the known calibration fluid. Now that it's calibrated I love it! 026 and the tank isn't, new animals will go into shock. Bought this one to check my old one, this one checked right on the dot at 1. All very easy and I feel as though I am getting an accurate salinity reading.

Overall Score
4.0

[star rating="4"]
(58 Points)

6. Coralife BioCube Mini Aquarium Hydrometer

User Ratings: 37 28

Coralife 100115642 First Impressions

"NO BUBBLES!"

My corals will be much happier now. Every time I leave to do something I come back and it's at the bottom of my tank. And it is much more accurate than my old salinity meter. This device is a godsend and so much easier and cleaner to use. It is a little cheaper made but it works great for the cost! Just give me one simple, accurate reading to go by, and I'm happy. When I saw the price offered on this one, I decided to buy and I love it.

  • Coralife BioCube Mini Aquarium Hydrometer
  • Can remain submerged inside your aquarium or sump
  • Know your salinity in a glance
  • Compact design allows for discreet placement in the aquarium
  • Ideal for all saltwater aquariums and sumps
  • Manufacture: Central Garden & Pet
  • Product Dimensions: 3.9 x 1 x 6 inches; 0.8 Ounces
  • Editor's Impressions Of The Coralife 100115642
  • Accuracy [star rating='3.4']
  • Quality [star rating='4.3']
  • Value For Money [star rating='2.8']
  • Affordability [star rating='3.9']

Coralife 100115642 Final Thoughts

"I say it works very well."

Waterproof if you accidentally drop it in the pool. Do not spend money on calibration fluid to calibrate this meter. I use this for my 10g brackish and it works ok. I use this for my 10g brackish and it works ok. There are conversion charts and tables online. Wipe down glass surface to dry it and put it back on the shelf til next time. I would recommend you to purchase this and skip the other ones.

Overall Score
3.3

[star rating="3.3"]
(57 Points)

7. LemonBest 0%-10% Automatic Temperature Compensation Salinity Refractometer Salt Water Aquariu...

User Ratings: 75 5

LemonBest First Impressions

"Great tool."

I don't want to deal with temperature correction or. When I compared it to what my local pet store was reading my water at it was dead on. Used distilled water to calibrate, the screw is located under the rubber cap. This one here was much cheaper,& exactly the same as they sold in the store. At first, I was getting bubbles sticking to the rotating arrow. Definitely a lot cheaper than a refractometer. I decided to upgrade and it was easy to calibrate.

  • LemonBest 0%-10% Automatic Temperature Compensation Salinity Refractometer Salt Water Aquarium by Lemonbest
  • Features with automatic temperature compensation (ATC) function
  • Designed for testing the concentration of salt water and brine, ideal for aquariums, marine monitoring and quality control in research and clinical laboratories
  • With just a couple of drops of aquarium water you know exactly what the salinity is
  • Measures on 2 scales, specific Gravity (D 20/20) and parts per thousand (‰), provides a direct reading of the specific gravity and concentration of salt in water
  • Comes with a hard case, dropper, screwdriver and cleaning cloth
  • Manufacture: Lemonbest
  • Product Dimensions: 7.87 x 1.57 x 1.57 inches; 3.88 Ounces
  • Editor's Impressions Of The LemonBest
  • Accuracy [star rating='5']
  • Quality [star rating='5']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

LemonBest Final Thoughts

"Easy to use."

Make sure to knock out the bubbles on the white dial by hitting it with your knuckle. It works OK but seems pretty flimsy and it's feel that way. My only criticism would be that it's a little too dark. I don't know if that's a positive or negative but just different. Just rinse with warm water afterwards. I bought this and a hydrometer because of the reviews saying its not accurate. Pretty darn accurate for the price.

Overall Score
4.5

[star rating="4.5"]
(315 Points)

8. Hikari AccuProbe Aquarium Hydrometer, Full

User Ratings: 68 10

Hikari 96010 First Impressions

"Couldn't be happier."

This device is a godsend and so much easier and cleaner to use. Bought this as a back up refractometer. I bought this salinity meter for my aquarium. My corals will be much happier now. I can check the water in 5 seconds without squinting. A hydrometer for making sure you have the right saltwater mix. Pretty darn accurate for the price.

  • Hikari AccuProbe Aquarium Hydrometer, Full
  • "Dry Hands" design avoids contamination of aquarium or water sample
  • Accurate to 0.001 specific gravity and salinity (PPT) measurements
  • Auto-temperature correcting design
  • Designed to give a temperature-corrected reading in warm water aquariums – 68°F to 85°F (20°C to 30°C)
  • Self-leveling, hanging device included
  • Manufacture: Phillips Feed & Pet Supply Natural Balance
  • Product Dimensions: 11 x 1 x 4 inches; 3.2 Ounces
  • Editor's Impressions Of The Hikari 96010
  • Accuracy [star rating='4.8']
  • Quality [star rating='3.8']
  • Value For Money [star rating='3.9']
  • Affordability [star rating='4.9']

Hikari 96010 Final Thoughts

"Easy to use."

There are conversion charts and tables online. If you let it sit in the tank overnight, it definitely gives an accurate reading. Very easy, turn screw very slowly to calibrate. The water was at what I expected it should be. Does just as good of a job of any meter you would buy at the store! If you read the directions in the box for the refractometer it's for freshwater. Used distilled water to calibrate, the screw is located under the rubber cap.

Overall Score
4.3

[star rating="4.3"]
(9 Points)

9. Digital Salinity Tester for Salt Water - Aquarium Salinity Meter with ATC, IP67 Waterproof, 0-200 PP...

CIZTADA First Impressions

"Works great for reefing!"

Functions just as it is supposed to. Looks to provide very accurate readings. Waterproof if you accidentally drop it in the pool. Does just as good of a job of any meter you would buy at the store! I have a 2000+ gallon pond and I just put salt in it last month. Comes with a nice carrying case for easy and secure transportation. Good quality and simple to use refractometer.

  • 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
  • [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] 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. This makes it more convenient to use in different temperature
  • [Easy Reading with LCD Backlight] There is no need to worry about seeing the displayed value if the light is insufficient. Ciztada salinity meter features a green backlit LCD to help you see the measurement results clearly in any situation
  • [Multifunctional Salinity tester]: The Ciztada multi-parameter Tester can test Salinity, TDS, EC and Temperature in an accurate, quick and reliable manner for most regular water solutions' testing. Support One-tap switch from salinity to TDS/EC
  • [Wide Applications]: Measures saltwater or salinity of water, ideal for aquarium, marine monitoring, salty pools & spas, koi fish pond, hydroponics and etc
  • Manufacture: CIZTADA
  • Batteries: 3 LR44 batteries required. (included)
  • Editor's Impressions Of The CIZTADA
  • Accuracy [star rating='5']
  • Quality [star rating='4.6']
  • Value For Money [star rating='4.6']
  • Affordability [star rating='5']

CIZTADA Final Thoughts

"Accurate so far!"

Too that makes it appear too cheap. It says in the instructions to use distilled water. This is perfect to keep a check on the salt level in your tank. Normally that gives the more accurate reading. Once I adjusted the refractometer, my aquarium salinity read 1. Bought this one to check my old one, this one checked right on the dot at 1. Bought this one to check my old one, this one checked right on the dot at 1.

Overall Score
5.0

[star rating="5"]
(1 Points)

10. NEW RHS-10ATC 0-10% Salinity Refractometer Salt Water Aquarium

User Ratings: 53 7

Ade Advanced Optics RHS-10ATC First Impressions

"So, it does seem to work."

Definitely a lot cheaper than a refractometer. I bought this refractometer as a more accurate option for salinity than a hydrometer. But there are some ways to keep on getting accurate readings. I bought this salinity meter for my aquarium. Small problem with bubbles on the needle but other than that no issues. The reading is big enough for you to read and it comes with the batteries. I don't know if that's a positive or negative but just different.

  • NEW RHS-10ATC 0-10% Salinity Refractometer Salt Water Aquarium
  • Manufacture: Ade Advanced Optics®
  • Editor's Impressions Of The Ade Advanced Optics RHS-10ATC
  • Accuracy [star rating='3.1']
  • Quality [star rating='4.8']
  • Value For Money [star rating='3.9']
  • Affordability [star rating='3.1']

Ade Advanced Optics RHS-10ATC Final Thoughts

"I recommended!"

I bought this and a hydrometer because of the reviews saying its not accurate. I have gone two years in this hobby with a hydrometer. Very easy, turn screw very slowly to calibrate. Very quick to calibrate and to use. Just give me one simple, accurate reading to go by, and I'm happy. Clear readout with the ability to calibrate and focus. Excellent piece of equipment for the price.

Overall Score
3.9

[star rating="3.9"]
(68 Points)

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