Best Co2 Dauertest 2026

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Last Updated - 27.03.2026

Best Choice

01

Measury

Measury CO2 Continuous Test Aquarium, Made in Germany, 30 ml Test Fluid 20 mg/l, CO2 Test Drop Checker, CO2 Tester

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9.9

Exceptional

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Main highlights

Test liquid made in Germany: Since the CO2 content in the aquarium is crucial to the health of its inhabitants, we have not made any compromises. Our 30 ml CO2 test liquid is produced in Germany in an ISO certified production facility.
Super strong suction cup: Thanks to the extra strong suction cup, the permanent test holds firmly on the window.
High quality borosilicate glass: Clear, perfectly shaped borosilicate glass, as used in laboratory equipment, makes the long-term test a real eye-catcher.
Delivery contents: 1 x CO2 continuous test glassware, 1 x 30 ml indicator liquid 20 mg/l, 1 x suction cup, 1 x instructions in German
CO2 measurement in the aquarium: By a change of colour of the test fluid, which is filled into the continuous test, the CO2 content in the aquarium can be determined. If the CO2 content in the aquarium is 20 mg/l, the solution turns green

19,95 €
02

Measury

Measury CO2 Continuous “Orb” Test for Aquariums - Made in Germany - 30 ml Test Fluid 20 mg/l - CO2 Test Drop Checker - CO2 Tester

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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

Test liquid made in Germany: As the CO2 content in aquariums is crucial to the health of its inhabitants, we have not compromised at all. Our 30 ml CO2 test liquid is produced in Germany in an ISO-certified production facility
Super-strong suction cup: the test orb holds firmly on the glass thanks to its extra-strong suction cup
High-quality borosilicate glass: clear, perfectly shaped borosilicate glass, as used in laboratory equipment, makes the test orb a real eye-catcher
CO2 measurement in aquariums: Determine the CO2 level in your aquarium by observing a change of colour in the test fluid, which is filled in the continuous test. If the CO2 content in the aquarium is 20 mg/l, the solution turns green
Box contents: 1 x CO2 continuous test glassware, 1 x 30 ml indicator liquid 20 mg/l, 1 x suction cup and 1 x instructions in German (English language not guaranteed).

19,95 €
03

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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9.7

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

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

5,65 €
04

JBL

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

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9.6

Exceptional

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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

13,25 €
Value for Money

05

Aqua Rebell

Aqua Rebell – CO2 Check – 20 mg per Litre

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10% 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

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

18,01 € 19,99 €(10% Off off)
06

Aqua Rebell

Aqua Rebell – CO2 Check – 20 mg per Litre

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10% Off
9.2

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

18,01 € 19,99 €(10% Off off)
07

WEILAOK

WEILAOK Co2 Continuous Test Aquarium, Co2 Test Aquarium, Co2 Continuous Test for Accurate Determination of Co2 Content for Freshwater Aquariums and Planted Aquariums, 15 ml

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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

Protection for aquariums: the co2 meter aquarium real-time monitoring of the CO₂ concentration ensures healthy growth of aquatic plants, improves the overall ecological quality of the aquarium and prevents problems with biological survival or landscape design due to inappropriate CO₂ concentrations.
Precise colorimetric detection: the CO2 permanent test aquarium colour change of the liquid measures the CO₂ concentration in the aquarium precisely. If the CO₂ content is too low, the colour changes to blue, with normal CO₂ content to green and if the CO₂ content is too high to yellow.
Practical suction design: the included suction cup and glass container allow the test solution to stick to the aquarium pane, making it easier for long-term observation. By applying a small amount of water to the suction cup, the adhesion can be improved.
Continuous CO₂ measurement in aquariums: Co2 test aquarium By continuously adding test fluid and observing the colour change, you can measure the CO₂ concentration in an aquarium precisely and continuously.
Application scenarios: This device is primarily used for continuous monitoring of CO₂ concentration in aquariums and is a practical tool for lovers of planted aquariums and the maintenance of aquarium ecosystems. It is particularly suitable for those who need long-term and stable monitoring of the CO₂ concentration in the aquarium.

13,59 €
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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9.0

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 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

NoxGule

NoxGule Co2 Continuous Test Aquarium, Co2 Test Aquarium, Co2 Continuous Test, 15 ml Indicator Solution + Glass Monitor, for Continuous Measurement of Co2 Concentration, Suitable for Freshwater

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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

Quick application: the CO2 system aquarium complete set is made of high-quality glass and has a reinforced, strong suction cup that securely attaches the test cup to the aquarium window. It is suitable for freshwater aquariums of different sizes and allows for highly visible measurement
Product information: This CO2 permanent test aquarium has a 15 ml indicator with high sensitivity and a glass test tube. It allows precise control of CO₂ concentration in freshwater aquariums, creating a stable and healthy living environment for fish, shrimp and aquatic plants. An indispensable tool for aquarium care
Precise measurement: fill the indicator solution into the glass test tube. The indicator changes colour according to the colour of the test tube and thus shows the CO₂ content in the aquarium. Yellow means too much CO₂, green an optimal CO₂ concentration and blue too little
How to use: simply put the test solution into the gauge, attach the pre-installed suction cup to the test tube and stick it to the aquarium wall. Read the carbon dioxide concentration through the colour of the test solution in the transparent glass and decide whether you should increase, lower or maintain the carbon dioxide concentration in the aquarium
Easy to use: Fill the test solution into the tester. With a CO₂ concentration of 20 mg/l in the aquarium, the solution turns green. Effortlessly avoid fish and shrimp dying as well as aquatic plant death due to concentration imbalances. You do not need professional equipment or expertise; even beginners can precisely adjust the CO₂ system and quickly assess the water quality

12,69 €
10

Editbar

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

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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

【Package Includes】: You will receive 4 CO2 continuous test aquariums and 4 suction cups, including 2 hanging CO2 glass testers and 2 round CO2 glass testers. Sufficient for daily use and replacement. The streamlined and practical design allows you to easily monitor and control the water quality in the aquarium. (This product does not contain CO2 indicator fluid.)
【Multi-purpose】The aquarium CO2 tester is suitable for all kinds of aquariums, especially plant aquariums and tropical aquariums. It helps you monitor the CO2 content in the water and keep your fish and plants healthy.
【High Quality Materials】:This CO2 test aquarium dropper is made of high quality glass, crystal clear, durable and corrosion resistant. It is easy to observe and clean. Users can intuitively observe the colour change of the CO2 indicator in the detector.
【Easy measurement】: Simply fill the CO2 indicator into the CO2 glass instrument and attach it to the inner wall of the aquarium with the suction cup. The CO2 indicator solution glows blue for low CO2 content, green for optimal CO2 content and yellow for excessive CO2 content. Please change the liquid every three weeks to ensure accurate and reliable results.
【Adsorption Design】This CO2 glass tester is specially designed for aquariums. Equipped with a strong suction cup, it sticks firmly to the inner wall of the aquarium, does not take up space in the aquarium and does not hinder the fish in their movement.

9,99 €