Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested

Whether or not you have already got a saltwater aquarium or are planning to maintain one, then you are probably aware that, they require the right ranges of salt. Levels that may be troublesome to get to, particularly since combining the salt and water is a task that you will need to do yourself. We just lately got down to discover the most effective hydrometer for saltwater aquariums – learn more by reading the outcome of the tests we carried!

Just making a judgement call on what might be the correct quantity of salt will be a struggle to evaluate, and that is the place a hydrometer excels, as they will actually assist in correctly measuring the salt levels are just right. So, with all this considered, this is a look at a chosen few that have worked well when tested and will help you decide on the most effective hydrometer that will work best for your needs.

Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK


The key thing when working with any saltwater aquarium is to ensure you get the Salt Levels right

Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Dennerle Nano Marinus Densimeter Hydrometer
Tropic Marin Hydrometer
Instant Ocean Hydrometer
Coralife Energy Savers ACLAF877 Deep Six...
Aquarium Equip Glass saltwater Hydrometer...
Dimensions (cm)
16.5 x 2 x 2
39.8 x 3.8 x 3.8 cm
38.1 x 15.2 x 20.3
17 x 2 x 12
27.2
Weight (g)
18.1
240
54.4
90.7
20.6 x 2 x 2
Reviews
Main Outstanding Feature
Calibrated to 25 °C
High-precision gravity readings
'No wet hands' design
Self levelling, hanging device
Measures temperature and specific gravity of water
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Dennerle Nano Marinus Densimeter Hydrometer
Dimensions (cm)
16.5 x 2 x 2
Weight (g)
18.1
Reviews
Main Outstanding Feature
Calibrated to 25 °C
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Tropic Marin Hydrometer
Dimensions (cm)
39.8 x 3.8 x 3.8 cm
Weight (g)
240
Reviews
Main Outstanding Feature
High-precision gravity readings
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Instant Ocean Hydrometer
Dimensions (cm)
38.1 x 15.2 x 20.3
Weight (g)
54.4
Reviews
Main Outstanding Feature
'No wet hands' design
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Coralife Energy Savers ACLAF877 Deep Six...
Dimensions (cm)
17 x 2 x 12
Weight (g)
90.7
Reviews
Main Outstanding Feature
Self levelling, hanging device
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Aquarium Equip Glass saltwater Hydrometer...
Dimensions (cm)
27.2
Weight (g)
20.6 x 2 x 2
Reviews
Main Outstanding Feature
Measures temperature and specific gravity of water
Click for Price

What Is A Hydrometer?

A hydrometer can basically be described as a device that you simply use for measuring the precise gravity/salt levels of a liquid, primarily based on buoyancy. Their design is based on having a sealed hollow tube with a wider lower area to help its buoyancy, as well as a slim stem marked up for taking accurate measurements.

Hydrometers work great for measuring the density of completely different liquid types – ranging from wine, alcoholic drinks, milk, and salty water.

How Does a Hydrometer Work?

As most fishkeepers are aware, getting saltwater aquariums just right can be a difficult task, and can sometimes require a huge amount of time and expertise to do it right. This includes the task of mixing your saltwater and measuring it to make sure you get it right the first time. It’s an exercise that’s of the utmost significance and getting the mixing process right the first time around will make your life a lot easier.

If you make a number of mistakes in the mixing process, chances are your saltwater will have too much or too little can be risky to your fish. Salinity ranges which can be too excessive or too low may have a detrimental impact on your fish. Getting things wrong often leads to stress at best and illness or even death – at worst.

Putting all this into consideration, it is increasingly important that all fishkeepers measure the salinity in the water in aquariums. It must be at the right level and to make sure of this, a hydrometer that will correctly measure it is required.

Best Hydrometers For Saltwater Aquariums

Dennerle Nano Marinus Densimeter Hydrometer
  • Nano marinus densimeter (aräometer)
  • Measuring range 1,000 - 1,040 g/ml
  • Calibrated to 25°c

Features

  • Safe Material: Made of plastic, aquarium clear Automatic Accurate Readable SaltWater Hydrometer.
  • Durable Clear Acrylic: Accurate, durable, and easy to read your marine aquarium’s salt level and specific gravity, Small and waterproof.if the specific gravity between 1.000 – 1.019, show that the specific gravity is small; if the specific gravity between 1.020 – 1.023, show that the specific gravity is normal; if the specific gravity between 1.024 – 1.030, show that the specific gravity is big;
  • Clearly Safe Zone Indicated: Includes salinity and specific gravity scales. The outside rang of the scale indicates salinity(PPT). The inside range of scale indicates gravity. And with safe zone clearly indicated. Range of use: 0-40 degrees (1.000-1.030).If the salinity ppt between 32 – 40,show that the salinity hydrometer is high; If the salinity ppt between 27 – 31,show that the salinity hydrometer is normal; If the salinity ppt between 0 – 26,show that the salinity hydrometer is light.
  • Wide Usage: Fit for brackish and marine aquariums.Perfect for testing both salinity and the specific gravity of your brackish and marine tank. Includes salinity and specific gravity scales. Suitable for freshwater and seawater.
  • Easy to Read and Use: The easy-to-read swing-arm pointer and extra-wide stable base provide an accurate test result.

 

Dennerle Nano Marinus Densimeter Hydrometer

I was curious about the Dennerle Nano Marinus Densimeter Hydrometer as it looked a bit lightweight and I was concerned that it wouldn’t hold up to proper use. Gladly, I was wrong.

The Dennerle Nano Marinus Densimeter Hydrometer is made from hard plastic and looks a lot like what most women use for pregnancy tests. While is small enough to fit in the palm of your hand, everything you need to do can be clearly read.

The density meter comes in a simple, small cardboard box that is similar in size to the density meter itself. using this hydrometer is pretty much the same as for the larger versions. It’s just a case of preparing the water, ideally, by mixing it using a pump for a while, let the water rest and bring it to 25°C using a heating element and take the measurement in calm water. You can then take your measurements.

The Dennerle Nano Marinus Densimeter Hydrometer is pretty easy to use for most beginner fishkeepers.

Read customer reviews on Amazon here!

Features

  • Used for measuring sodium chloride saturation of salt brines in various industries including food, fishing, and transportation
  • Range: 0 to 100% by saturation; Divisions: 1%; Accuracy: ±1%; Length: 280 mm (11″)
  • Individually serialized; Lead-free ballast and glass
  • Temperature standardization: 60°F (15°C)
  • Packaged with a multi-language (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy indicating accuracy traceable to NIST

Tropic Marin Hydrometer

One of the initial things you notice when unpacking the Tropic Marin hydrometer is how it feels. But do not be fooled by the syringe-like look as it is a pretty accurate device that is well worth the money.

It does not require any calibration, as this hydrometer is very simple and easy to use. All you need to do is insert it into your saltwater aquarium water solution and based on the calibrated readings, read the percentage saturation.

It does need to be properly wiped down, cleaned and stored away following use. As any salt solution left on it will adversely affect the accuracy of your readings going forward.

Read customer reviews on Amazon here!

   (just edited)

Features

  • Instant Ocean 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

Instant Ocean Hydrometer

The first thing to say regarding this hydrometer is that it comes with a full range scale of features that are really easy to read. It also has a no hands wet feature that ensures you are able to use the hydrometer without getting your hands wet.

During the first number of times when I used this hydrometer, I found myself becoming more and more frustrated. I was getting bubbles stuck to the swinging arm on every use, preventing an accurate reading. I soon figured out, however, that this unit has a small water inlet trough that runs down the side. Use this and the flow of water slows, resulting in no bubbles every time.

Coralife Energy Savers ACLAF877 Deep Six...
  • Included components: All Components included in Picture and Description

Features

  • Self-levelling, hanging device
  • Allows your hands to stay dry
  • Avoids contamination of aquarium.

Coralife Energy Hydrometer

By the point I examined this hydrometer, I’ve to confess, I used to be starting to fall in love with the simplicity and ease of use of this stuff, and this one wasn’t any completely different. You merely fill it up, take the studying, rinse it out.

Delivering full-range salinity and particular gravity readings, this hydrometer is appropriate for all. It additionally delivered extremely exact outcomes being sole +/- 1-2 distinction from my refractometer.

This hydrometer is a product of sturdy plastic with simple to learn markings. Although I’ve solely used it a number of instances so far, it appears like merchandise I’ll have for a very long time.

Hydrometer VS Refractometer

A hydrometer is not the only option you have available to you when it comes to checking the specific gravity of your saltwater. An alternative option will be to use a refractometer which does the same job but in a different way.

Which ever one you opt for will have its own pros and both have their cons as further discussed below. We will leave it up to you which one you choose to measure your saltwater specific gravity.

Refractometer

Pros

  • Very accuracy
  • The build is often high-quality
  • Relatively easy to clean

Cons

  • Needs to re-calibration regularly
  • Can be expensive

Hydrometer

Pros

  • Easy to operate
  • Cheap to buy
  • Easy to read

Cons

  • Not as accurate if used incorrectly
  • Parts can degrade over time when not wiped down properly after use.

How To Use A Hydrometer

There are two different types of hydrometers, both of which have different instructions for use.

Swing Arm Hydrometer

The more popular of the two hydrometers, the swing arm, is also the cheaper option to buy. It is often found online and in most aquatic stores. It is simply a case of filling it up by putting it into your aquarium and then placing it on a surface that is level. The needle inside will then rise according to the salt levels in your water to give you a reading.

Floating Hydrometer

This looks just like a thermometer but a floating hydrometer works differently to the swing arm type. You just need to place the floating hydrometer into your saltwater aquarium, and it will float according to the salinity. The level at which your hydrometer floats will show if you have too much or too little salt. Floats too high, you need less salt and sinks you need more.

Please note that before the first use of a new hydrometer you may need to season it for twenty-four hours. Seasoning is a process where you soak your new unit in salty water for a 24-hour period before you use it.

What Is Specific Gravity In A Saltwater Aquarium

Specific Gravity (SG) is the ratio of the density of any substance to the density of another substance taken as standard. In the case of aquariums, water is the standard as it is for all liquids and solids, whilst hydrogen or air, just for your info, are the standards for gas.

The best is to aim for the specific gravity (SG) in your aquarium to be in the same range to that of natural seawater. This would equate to an SG of around 1.026 or 35 grams salinity per litre. It should be noted, however, that SG can vary from ocean to ocean and hence fish species to fish species. You should always check out a species requirements before adding them to any aquarium that may, or may not, have a suitable SG.

What To Look For When Buying A Hydrometer For Your Aquarium

The most important thing to look out for when choosing a hydrometer is that it can definitely be used to measure salinity. There is a wide range of hydrometers out there on the market and not all will be fit for purpose.

 

Storing & Cleaning Your Hydrometer

All hydrometers, but especially the swing arm type, need to be kept clean in order to maintain their accuracy. This is due to salt crystals building up on the needle arm and weighing it down causing inaccurate readings.

To keep your hydrometer clean you should rinse it in fresh, clean water after every use to stop the salt from your aquarium water accumulating. If it is too late for that and your hydrometer has become crusty do not despair. Crustiness can be removed easily by soaking in vinegar for 30 minutes. Please note, however, the whole hydrometer should be covered, so may need weighting down to stop it from floating.

You should store your hydrometer somewhere dry and safe from becoming damaged. This is especially true if you choose a floating hydrometer as they are typically made from fragile glass.

 

Recap: Top 5 Hydrometers For Saltwater Aquariums

Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Dennerle Nano Marinus Densimeter Hydrometer
Tropic Marin Hydrometer
Instant Ocean Hydrometer
Coralife Energy Savers ACLAF877 Deep Six...
Aquarium Equip Glass saltwater Hydrometer...
Dimensions (cm)
16.5 x 2 x 2
39.8 x 3.8 x 3.8 cm
38.1 x 15.2 x 20.3
17 x 2 x 12
27.2
Weight (g)
18.1
240
54.4
90.7
20.6 x 2 x 2
Reviews
Main Outstanding Feature
Calibrated to 25 °C
High-precision gravity readings
'No wet hands' design
Self levelling, hanging device
Measures temperature and specific gravity of water
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Dennerle Nano Marinus Densimeter Hydrometer
Dimensions (cm)
16.5 x 2 x 2
Weight (g)
18.1
Reviews
Main Outstanding Feature
Calibrated to 25 °C
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Tropic Marin Hydrometer
Dimensions (cm)
39.8 x 3.8 x 3.8 cm
Weight (g)
240
Reviews
Main Outstanding Feature
High-precision gravity readings
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Instant Ocean Hydrometer
Dimensions (cm)
38.1 x 15.2 x 20.3
Weight (g)
54.4
Reviews
Main Outstanding Feature
'No wet hands' design
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Coralife Energy Savers ACLAF877 Deep Six...
Dimensions (cm)
17 x 2 x 12
Weight (g)
90.7
Reviews
Main Outstanding Feature
Self levelling, hanging device
Click for Price
Best Hydrometer for Fish Tank and Aquarium Use | Top 5 Reviewed And Tested, Aquarium Fish Tanks UK
Name
Aquarium Equip Glass saltwater Hydrometer...
Dimensions (cm)
27.2
Weight (g)
20.6 x 2 x 2
Reviews
Main Outstanding Feature
Measures temperature and specific gravity of water
Click for Price

F.A.Q

  • How accurate is a hydrometer? When used correctly, prepared correctly, and cleaned correctly, a hydrometer is will often remain accurate.
  • What does a hydrometer measure in a saltwater tank? The salinity of your saltwater in either specific gravity (SG) or salinity parts per thousand (PPT).
  • Which is more accurate, a refractometer or a hydrometer? It is widely accepted that a refractometer is more accurate than a hydrometer, but also comes at a higher cost as well.
  • What is the formula of seawater? Seawater doesn’t have one chemical formula as it is a solution. It is made up of NACL (salt) and H2O (water).

Conclusion: Best Saltwater Hydrometers

With hydrometers, there is no clear winner as a lot will depend on personal preference and what works best for your individual needs. All things considered though, all the hydrometers listed on this list are pretty much equal and a useful to use.

Check one out to see if it is the piece of saltwater aquarium equipment you have been missing all this while.