Professional test case for exact marine water analysis

  • Monitors the water values in marine aquariums simply and reliably. Determines: pH value, carbonate hardness, calcium, magnesium, copper, ammonium, nitrite, nitrate, phosphate, silicate, oxygen
  • Easy to use: add water to cuvette, add indicator, compare on scale / count drops until colour changes
  • Comparator system takes the inherent water colouring into account. Incl. water analysis report sheets & pen
  • Childproof reagent bottles, waterproof plastic case, refill reagents separately available
  • Package contents: 1 test case, incl. 29 reagents, 12 glass vials, 2 plastic cuvettes, 2 syringes, 3 measuring spoons, thermometer, pen, report sheets and analysis sheet, laboratory comparator system & detailed instruction for use
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Price: 132,13 €
Recommended retail price incl. VAT
You can find this item in your specialist and online shop
Product information

Don’t guess - measure:
Get a regular update on whether all the important water values in your marine aquarium are OK or whether there is a need for action to correct values that are developing in the wrong direction. If problems arise (sick fish, invertebrates not growing, algae problems) water analyses are really the only way to get to the bottom of it! Once the tests have helped you find the underlying cause, you can start to correct it.

The following tests are included in the test case:
pH test: acidity of the water from 7.4 to 9.0
O2 test: determination of the oxygen content
KH test: pH stability of the water (carbonate hardness)
PO4 test: determination of the phosphate content (reason for algae growth and plant nutrient)
Test NH4 / NH3: indication of non-toxic ammonium, determination of the toxic ammonia using table
NO2 test: determination of nitrogen compound nitrite, which is toxic for the fish
NO3-Test: determination of the nitrate content (reason for algae growth)
Cu Test: heavy metal deadly for invertebrates. Also important for adjusting the therapeutic dose of medications
SiO2 test: determination of the silicates (silicic acid) as cause for diatoms
Ca test: determination of the calcium content in marine aquariums. Needs to be between 400 and 440 mg/l for healthy coral growth
Mg/Ca test: determination of magnesium and calcium content in marine water aquariums. The magnesium content needs to be between 1200 and 1600 mg/l. During the procedure, first the Mg content is tested and then the Ca content. Subsequently, the value of the Ca content is subtracted from the Mg content and this is then the actual Mg content of the water.

The following tests are available as supplements:
pH test: acidity of the water from 3.0 to 10
pH test: acidity of the water from 6.0 to 7.6

Almost all test reagents are available as environmentally friendly refill packs!



Art. no.:
EAN Code:
11 tests
Volume packaging:
10.3 l
Gross weight:
1562 g
Net weight:
1270 g
Weight factor:
Packaging dimensions (l/h/w):
85/318/382 mm


Animal species: Corals, Gobies, Snails
Animal size: For all animal sizes
Animal age group: All aquarium fish
Material: Reagent(s) in plastic bottle(s) and/or glass bottle(s) + plastic and/or glass accessories. REFILL: reagent(s) without accessories.
Colour: white / transparent / black
Dosage: See instructions

Electronic label / illuminant

Mercury: No
Dimmable: No

Technical Data

Height:318 mm
Length:382 mm
Width:85 mm
Where can I find the record sheets for the documentation of my water analysis?

Have you lost your record sheets, used them all up, or need them in another language?
In the appendix of this FAQ you will find PDF files for printing them out in German, English and French.

Why are there different recommendations and values on the colour chart of the water test?

With the JBL PROAQUATEST drop tests you have a laboratory comparator system which compensates the inherent colouration of the water and at the same time enables non-chemists to carry out an accurate and safe water analysis. To ensure that water testing monitors the life of your fish and provides the greatest possible safety, you will find an evaluation adaptable to three different applications.

Above the different coloured measuring points are numbers, three symbols and a colour band for each.

The symbols stand for the following applications:
Fish = freshwater
Koi = garden pond
Starfish = marine water

The colour band tells you the meaning of the value determined in green (everything OK), yellow (attention) and red (need for action). In addition you will find numbers that reflect the value in mg/l for the respective colour field.

The first two (freshwater and pond) colour bands belong to the upper number row. Marine water belongs to the lower number row.

Why do the values differ?
Due to the high salt concentration in marine water, the colouring of the reaction is not as intense as in freshwater (which also includes pond). Consequently, the value for the same colouration is greater than in freshwater

Why do the recommendations differ?
Every habitat reacts differently to certain nutrient concentrations. In the garden pond, for example, constantly changing temperatures and light intensity can jeopardise the value more than in freshwater, where, unlike in the pond, these factors are constant and necessary additives are supplied. That’s why the recommendations are green for one area of application, yet yellow for the other.

I have lost my colour chart. Can I download the colour chart for the test?

The colour cards are not available for download on the JBL website. The absolutely accurate colour reproduction that is required can only be achieved using a printer which can be re-calibrated before each printout. Most privately used printers are not accurate enough for this.

You will find the colour chart bundle as a spare part on the respective product page and in the spare parts shop under: https://www.jbl.de/en/products/detail/8732/jbl-proaquatest-assortiment-color-chart

Why are there no colour charts for GH. KH, Mg /Ca saltwater and CO2 direct?

The tests from the test range: JBL GH test, JBL KH test, JBL calcium test Ca and JBL magnesium test Mg, where the number of drops are counted until the colour changes and the counted value is multiplied by a value:

GH = number of drops = general hardness in °dH

KH = number of drops = carbonate hardness in °dH

CO2 = number of drops * 2 = CO2 in mg/l

Magnesium + calcium = number of drops * 120 = amount Ca + Mg in mg/l

Calcium = number of drops * 20 = amount Ca in mg/l

Magnesium = amount Ca+Mg from magnesium test - amount Ca in mg/l = magnesium in mg/l

The instructions point out that the comparator block should be used to compare the colours. Can this be done without the comparator block as well ? Or is there a factor from this comparison that is required for the measurement ?

The colour charts are intended to be used with the comparator block. In addition, when the comparator block is used with the blank water sample, this compensates the inherent water colour.

Therefore, if the comparator block is not used, there will most likely be deviations in the readings.

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Blog (opinions & experiences)

JBL TV #53 How do you carry out water tests correctly and what are the most common mistakes?

Water tests for aquarium water can be very important, especially when there are problems.

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JBL PROAQUATEST - simple yet laboratory standard - Part II

Today we’re continuing on the topic of water tests, with Part II of the blog post from 22.01.2023. Enjoy reading.

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JBL PROAQUATEST - simple yet laboratory standard - Part I

Aquarium water tests are similar to a blood test at the doctor's. Water tests allow you to take a look at the water composition.

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JBL TV #43: All the important values in seawater - Testing saltwater reliably

This is how to be sure you’re checking the water values in your marine aquarium simply and safely.

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JBL water tests - how to test correctly and reap the benefits

Lots of scientists & experts swear by the JBL water tests, but why?

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JBL TV #27: Testing aquarium water - this is how it works

Water tests for aquariums: Aquarium water can be clear and still toxic to aquarium inhabitants!

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JBL TV #7: Why do fish die in high nitrite levels and what can be done about it?

How does the nitrogen cycle in the aquarium work? Why do nitrite values get too high and how can the value be reduced? Why adding salt is senseless.

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JBL TV #5: What is a pH value and why is it important for the aquarium?

Have you ever asked yourself exactly what makes up the logarithm of a pH value? Why does the pH value in our aquarium matter and how can we influence it?

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Misunderstandings – typical beginner mistakes

Based on our own experience in customer service and the many messages and questions we receive, we have put together the typical mistakes beginners may make. The experienced aquarist might well smile, but if they are honest, these are mistakes we all made at the start, aren’t they?

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Time For A Change - Pros And Cons

Think back to your childhood. Your bedroom was a small area for you to let your imagination run free. And unsurprisingly you felt like re-decorating and rearranging it at least every three weeks.

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How often do you need to test your pond or aquarium water?

Granted, nobody really enjoys testing water. It’s time-consuming and sometimes you’re not sure which colour on the chart your water result matches. But water testing really can be lifesaving – at least for your fish!

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Why is the KH higher than the GH?

Many aquarium owners think that the general hardness represents the total of all minerals and the carbonate hardness only a part of it. Then how can the carbonate hardness sometimes be higher than the total of minerals?

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Carbonate Hardness – The Life Insurance for the Aquarium

The carbonate hardness (not the general hardness!) contains components which stabilize the pH level. They prevent extreme pH levels and ensure the aquarium functions properly.

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Care products - The best solutions for your aquarium

With the right products, aquarium care is not only easy, but can also be a lot of fun! The formulas that make up JBL products are based on intensive research and, especially with care products, their effects are not always immediately visible, yet in the medium and long-term they’ll result in a beautiful aquarium and healthy fish.

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Inaccurate water tests – or did I do something wrong after all?

In the aquarium scene we often hear people talking about “accurate” and “inaccurate” tests. But mostly they mean a rougher or finer scaling of the output values.

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Testing water – here’s how

The water in your aquarium is outstandingly significant because it is a life-giving element for fish and plants.

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Keeping an eye on the most important water values

Professional water analysis sounds very expensive. But the professional water testing in your aquarium or pond at home also works on a high level and above all it is simple and inexpensive.

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JBL has the largest range of water tests worldwide!

With 24 different water analysis tests for freshwater and marine aquariums and ponds as well as 8 different test cases, JBL offers the widest range of water tests worldwide. The second place is shared by two American manufacturers with 15 individual tests each, but with only 0 and 2 test cases respectively.

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JBL Water Tests Now Even Better

Scientists, aquarium owners, pond enthusiasts, and especially those who need reliable, accurate water tests, use JBL water tests. Over the years, the JBL development team has been collecting and is now ready to implement your suggestions for improvements.

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Reference guide (Themeworld)

Marine water

There is a solution to almost every problem! And the hardest part is finding the cause of the problem.


Recognising and treating fish and invertebrate diseases

Deficiency symptoms

Here’s how to prevent deficiency symptoms in fish and plants

Algae control

Here’s how to combat algae successfully and lastingly.

Marine water treatment

What maintenance does your marine aquarium need?

Testing water

Testing water – the most important step to understanding your aquarium. Why is water testing necessary?

Fish breeding in aquariums

Would you also like to breed your fish? What do you have to consider when breeding?

The marine aquarium

Holiday at the coral reef - in your own living room! Marine aquariums are the most exciting branch of aquatics

Aquascaping aquarium type JBL Dreamscape®

Mountains, valleys, meadows and fish! Create your dreamlike landscape under water with the Dreamscape® aquarium

Marine water - the water

What exactly is marine water? What is so special about marine water? How to create perfect marine water?

Algae - the plants of the marine water

Which plants can you have in your marine aquarium? What do you need to consider when caring for higher algae?

Marine animals

Which animals are suitable for your marine aquarium?

Daily care

How much daily or weekly care is involved? What are the basic maintenance measures for your aquarium?


Additional product information and downloads

safety instructions

spare parts
Safety information
JBL ProAquaTest Lab Marin - safety information in accordance with GHS
Signal word
Hazard symbol
  • GHS02
  • GHS05
  • GHS07
  • GHS08
  • GHS09
Risk phrase
EUH031: Contact with acids liberates toxic gas.
EUH208: Contains $. May produce an allergic reaction.
H225: Highly flammable liquid and vapour.
H302: Harmful if swallowed.
H314: Causes severe skin burns and eye damage.
H317: May cause an allergic skin reaction.
H318: Causes serious eye damage.
H334: May cause allergy or asthma symptoms or breathing difficulties if inhaled.
H335: May cause respiratory irritation.
H341: Suspected of causing genetic defects.
H373: May cause damage to organs through prolonged or repeated exposure.
H400: Very toxic to aquatic life.
H411: Toxic to aquatic life with long lasting effects.
safety note
P101: If medical advice is needed, have product container or label at hand.
P102: Keep out of reach of children.
P103: Read carefully and follow all instructions.
P303+P361+P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water [or shower].
P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P501a: Dispose of contents/container in accordance with local regulations.
Hazard-determining component
121-57-3: sulphanilic acid
1310-58-3: potassium hydroxide
1310-73-2: sodium hydroxide
1336-21-6: ammonia
137-09-7/1: Amidol
137-09-7/2: Amidol
541-69-5: m-phenylenediamine dihydrochloride
60-00-4: edetic acid
64-19-7: Acetic acid
67-63-0: propan-2-ol
7647-01-0/1: hydrogen chloride
7664-93-9: sulphuric acid
7681-52-9/1: sodium hypochlorite, solution
7773-01-5/1: manganese dichloride
Customer reviews


Overall rating: 5.0
7 public review(s) for this product.

0 Reviews

7 more reviews in other languages

7 Reviews in other languages

Z. Khawaja - German

Z. Khawaja - German

Top Produkt

Genaue Werte und sehr einfach zu messen.

Nur zu Empfehlen

S. Tejera Galindo - Spanish

El maletín viene equipado con una gran diversidad de test para realizar las pruebas de calidad de agua en el acuario marino. Me resulta bastante cómodo usarlo ya que las instrucciones son muy intuitivas y te indican como solventar alguna irregularidad en los resultados del test.

bennys riff welt - German

Hallo an alle Meerwasser Freunde

Der BL PROAQUATEST LAB Marin ist echt Mega geil man hat alles zusammen was man brauch zum Messen. sie Wasser Test sind echt sehr gut.

Grade Als Anfange macht man hier nicht mit Falsch.

Die Anleitung sind auch verständlich und sollte jeder verstehen.

was schön ist man kann schnell mal zum Freund und helfen

Weil man alles zusammen hat.

ich kann ihn echt weiterempfehlen.

JBL Echt Top Koffer

GarnelenTV - German

Wassertesten im Meerwasserbereich ist das A und O. Ich hab total Spaß daran meine Wasserwerte zu testen und dank der einfachen Anleitung versteht man es auch sofort.

Sehr praktisch sind die hilfreichen Tipps mit Produkt Empfehlungen, wenn die Wasserwerte nicht im grünen Bereich sind.

Kann ich auf jeden Fall weiterempfehlen.

J. Mundt - German

sehr komplette ausstattung und man kann alle tests in einem zuge durchführen, da genug messzylinder vorhanden sind.

der umfang der testmöglichkeiten lässt für das monitoring des meerwasseraquariums keine wünsche offen.

ich kann den messkoffer auf jeden fall empfehlen.

Phils_waterplants - German

Ganz toller Testkoffer. Wird sogar mit Kugelschreiber geliefert! So kann man seine Werte direkt in die ebenfalls mitgelieferte Tabelle eintragen. Die Tests sind sehr genau. Dies habe ich gegengetestet. Ich kann den Koffer uneingeschränkt weiterempfehlen, man hat direkt alles was man braucht um seine Wasserwerte professionell zu testen. Das ist gerade im Meerwasserbereich unerlässlich!

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