JBL ProAqua Test Permanent CO2/pH

JBL ProAqua Test Permanent CO2/pH

  • Safe determination of the CO2 content
  • You needn't mix this indicator with aquarium water
  • Easy to read
  • Perfect for optimising the CO2 content of an aquascape
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Mode of operation: The CO2 diffuses from the aquarium water into the air column within the permanent test casing and from there into the indicator liquid. As a result of the diffusing CO2 the pH value of the indicator changes and consequently also its colour, which is then compared on the colour scale. In this way the CO2 level and also the pH value can be read.

If however the pH value in the aquarium has been influenced by other factors (peat, pH-Minus), then the indicator of the JBL Pro Aqua permanent test cannot react because these acids cannot diffuse into the indicator via the air column. The indicator always merely displays the pH value which is reached due to CO2.

The displayed CO2 level of the JBL permanent test is always correct, independent of any substances in the aquarium waters that are affecting the water.


  • A special indicator instead of aquarium water permits direct measurement of the CO2 level in mg/l
  • Replace the indicator only every 3-4 weeks = lasts a total of 9-12 months
  • Indicates the pH value (6.4 - 7.8) in addition to the CO2 level



JBL is a traditional German company with a very wide range of products for aquarists. From high-quality fish and shrimp food to external filters and water plant fertiliser, JBL offers a wide selection for aquarium enthusiasts.

JBL's research and development constantly brings new, innovative products onto the market. Whether aquascape, fish aquarium, shrimp tank with a scurry factor or a pure water plant aquarium in Holland style, JBL offers suitable aids for set-up and maintenance for all these directions.

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