Best Co2 Dauertest 2026

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Last Updated - 03.02.2026

Best Choice

01

noble aqua

noble aqua CO2 Continuous Test Aquarium - Includes 150 ml CO2 Indicator Liquid - Permanent & Precise CO2 Test

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9.8

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

The CO2 test aquarium is suitable for all bio and compressed gas CO2 systems.
Strong hold: the included suction cup holds the continuous test securely on the disc
Elegantly designed and perfectly shaped, the long-term test is an eye-catcher in your aquarium
Easy measurement of CO2 content thanks to colour display for optimal plant growth and animal welfare
150 ml test liquid, colour change at 20 mg/l for accurate reading of CO2 content (2 x 75 ml)

19,90 €
02

Aqua Rebell

Aqua Rebell – CO2 Check – 20 mg per Litre

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Perfect for optimal CO2 content in an aquascape
Easy to read due to colour change at different pH values

18,01 €
03

JBL

JBL ProAquaTest CO2-pH Permanent ProScan Recharge with 24 Water Analysis Strips.

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9.5

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

For direct use thanks to the complete set with display container with suction cup, reagents and colour scale stickers, refill reagent available separately for refilling
Displays pH value from 6.4 to 7.8 and CO2 content
Continuous test for fertiliser control: place reagent in permanent test device and attach to the disc in the aquarium with teats, compare the reagent colour with colour scale sticker and read the value
Box contents: 1x JBL water test set, ProAquaTest CO2-pH permanent, includes 1 display container with suction cup, 2 reagents and colour scale sticker
Advanced water test series: simple and safe control of the water values of freshwater aquariums, ideal for permanent direct measurement of the optimal pH value and carbon dioxide content

13,77 €
Value for Money

04

Yerleomit

Yerleomit CO2 Continuous Test Aquarium Drop Checker Test Aquarium CO2 Monitor Aquarium Glass Capacity Meter Aquarium with Suction Cup for Planted Aquarium

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28% Off
9.4

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

CO2 continuous test aquarium with strong suction cup: the CO2 permanent test aquarium with strong suction cup, simply attach to the wall of your aquarium and does not fall off easily.
CO2 continuous test aquarium material: the CO2 continuous test aquarium made of high-quality glass, for measuring the CO2 content at a glance.
CO2 continuous test aquarium indicator colour shows results: the CO2 permanent test aquarium indicator solution is blue, if it is blue, this means that CO2 is insufficient; turns green, the CO2 balance; turns yellow, means that your tank contains too much CO2. Make the necessary adjustments and test until you turn green.
CO2 continuous test aquarium application: the CO2 permanent test aquarium is used to test and monitor the concentrate of the aquarium water plant aquarium and is suitable for aquariums, aquariums, especially water plants, tropical fish for observing and cultivating aquariums.
Box contents: 1 x CO2 continuous test aquarium (no including indicator solution), 1 x suction cups

4,09 € 5,65 €(28% Off off)
05

AllisWay

CO2 Continuous Test Aquarium, CO2 Test Aquarium Including 15 ml Indicator Solution System Aquarium Complete Set for Precise Monitoring Freshwater Aquariums

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Protect your aquarium: Thanks to the high-contrast colour gamut, the water quality is visible at a glance - without any specialist knowledge. Precisely adjust your CO₂ system to create the perfect aquarium. Even beginners can cope with it quickly.
Precise measurement: the CO2 indicator liquid set is highly sensitive and displays the values intuitively by colour changes of the indicator: yellow = too high, green = optimal range, blue = too low.
How to use: simply attach the suction cup to the test vessel and let it stick to the aquarium. The CO₂ concentration can be read through the transparent glass based on the colour of the test solution.
Carbon Dioxide Monitoring Kit: The CO2 dauertest aquarium kit contains a 15ml indicator and a test vessel to monitor the CO₂ concentration in your aquarium. It is ideal for observing and maintaining your aquarium and creates a worry-free living environment for your fish and shrimp.
CLEAR GLASS TEST JAR The co2 test aquarium set is made of high quality glass and features a strong suction cup that adheres securely to the aquarium wall. So it does not fall off easily and fits perfectly in any aquarium.

13,98 €
06

Aqua Rebell

Aqua Rebell – CO2 Check – 20 mg per Litre

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9.1

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Perfect for optimal CO2 content in an aquascape
Easy to read due to colour change at different pH values

17,76 €
07

SUPRROW

SUPRROW Pack of 4 CO2 Continuous Test Aquarium, CO2 Glass Aquarium Monitor, CO2 Test Aquarium Drop Checker Hanging, Co2 Glass Tester for Freshwater Aquariums, Planted Fish Tank

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8.9

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

PACKAGE INCLUDED - The set includes 4 CO2 endurance tests and 4 suction cups (2 hanging and 2 round glass testers). Ideal for monitoring water quality (without CO2 indicator fluid).
MULTIPURPOSE This CO2 tester is suitable for all aquariums, especially plant aquariums and tropical basins to monitor CO2 levels and promote the health of fish and plants.
High Quality Materials The CO2 test aquarium dropper made of clear, durable and corrosion resistant glass allows easy observation of the color change of the CO2 indicator.
EASY MEASUREMENT: Fill the CO2 solution into the glass tester, attach it with the suction cup. The colours show CO2 content: blue (low), green (optimal), yellow (high). Change liquid every three weeks for precise results.
ADSORPTION DESIGN Specially designed for aquariums, the strong suction cup holds the tester securely on the wall and ensures that it does not take up space in the aquarium and does not disturb the fish.

9,99 €
08

Generisch

Yerleomit CO2 Continuous Test Aquarium CO2 Diffuser Aquarium CO2 Test Aquarium Tester Aquarium Airstone CO2 Monitor Disc Capacity Meter Aquarium with Suction Cup for Planted Aquarium

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8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

CO2 continuous test aquarium with high-quality material: this round CO2 permanent test aquarium is made of high-quality glass material, which is durable and corrosion resistant. It resists chemicals and moisture in the water, ensuring a long service life. The round CO2 instrument has high transparency and users can visually observe the colour change of the CO2 indicator inside the detector.
CO2 continuous test aquarium with adsorption design: this round CO2 permanent test aquarium has been specially developed for aquariums. It is equipped with a strong suction cup that can be firmly adsorbed to the inner wall of the aquarium without taking up the space of the aquarium or affecting the activities of the fish.
CO2 continuous test aquarium indicator colour shows results: the CO2 permanent test aquarium indicator solution is blue, if it is blue, this means that CO2 is insufficient; turns green, the CO2 balance; turns yellow, means that your tank contains too much CO2. Make the necessary adjustments and test until you turn green.
CO2 continuous test aquarium application: the CO2 permanent test aquarium is used to test and monitor the concentrate of the aquarium water plant aquarium and is suitable for aquariums, aquariums, especially water plants, tropical fish for observing and cultivating aquariums.
Box contents: 1 x CO2 continuous test aquarium (no including indicator solution), 1 x suction cups

6,15 €
09

ARKA

ARKA mySCAPE-CO2 Checker Liquid - 15 ml - Reliable CO2 Monitoring with Colour Display Essential for Precise Aquascaping in Freshwater Aquariums

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8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Universal: the indicator solution is ideal for use with a CO2 test, such as the ARKA mySCAPE-CO2 checker from the ARKA mySCAPE-CO2 system or corresponding other commercially available CO2 testers.
Contents: 15 ml CO2 indicator liquid.
Colour impact: the CO2 test liquid shows the respective status of the CO2 supply in the aquarium using 3 different colours. Yellow = too high, green = optimal area, blue = too low.
ARKA mySCAPE-CO2 REFILLER: A CO2 test liquid with colour change, ideal for use in a corresponding CO2 continuous test, such as the ARKA mySCAPE-CO2 Checker.
ARKA Biotechnologie GmbH has been developing and producing high-quality products for aquariums, pond care, DIY supplies as well as accessories for dogs, cats and rodents for years – known for innovation and quality – made in Germany

5,89 €
10

ARKA

ARKA mySCAPE-CO2 Checker Liquid - 15 ml - Reliable CO2 Monitoring with Colour Display Essential for Precise Aquascaping in Freshwater Aquariums

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8.2

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

Universal: the indicator solution is ideal for use with a CO2 test, such as the ARKA mySCAPE-CO2 checker from the ARKA mySCAPE-CO2 system or corresponding other commercially available CO2 testers.
Contents: 15 ml CO2 indicator liquid.
Colour impact: the CO2 test liquid shows the respective status of the CO2 supply in the aquarium using 3 different colours. Yellow = too high, green = optimal area, blue = too low.
ARKA mySCAPE-CO2 REFILLER: A CO2 test liquid with colour change, ideal for use in a corresponding CO2 continuous test, such as the ARKA mySCAPE-CO2 Checker.
ARKA Biotechnologie GmbH has been developing and producing high-quality products for aquariums, pond care, DIY supplies as well as accessories for dogs, cats and rodents for years – known for innovation and quality – made in Germany

5,60 €