Aqua Rebell Orb Checker

Aqua Rebell Orb Checker

  • Made of high-quality glass
  • White interior for clear colour recognition of the indicator solution
  • No distortion of the colour change due to light refraction on the glass
  • Unique, round shape looks very unobtrusive
  • Suction cup included
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The Orb Checker White from Aqua Rebell is a drop checker that is very unobtrusive in the aquarium thanks to its special round shape. The integration of white glass on the inside of the Orb Checker ensures an accurate reading of the colour change in the indicator solution. Against the white background, the colour of the liquid can be clearly identified without distortion due to light refraction at the glass curves and without blinding by aquarium water in the background.
In an aquascape as well as an aquatic plant aquarium, long-term monitoring of the amount of CO2 added is very important. The Orb Checker White continuous CO2 test is the ideal way to check the CO2 content. The colour of the CO2 indicator liquid changes according to the amount of CO2 added. Green stands for an optimum CO2 value, blue for too little CO2 and yellow indicates too high a CO2 concentration in the aquarium / aquascape.

Further information in the Aquascaping Wiki at Filling a CO2 drop checker.


  • For permanent monitoring of the CO2 value
  • The delivery includes a transparent suction cup
  • With white coloured glass inside
  • For better recognisability of the liquid colour
  • Made from high-quality glass
  • Please note that the CO2 long-term test is supplied without long-term test liquid


Aqua Rebell Orb Checker White - Pico
Diameter ca. 2 mm
Aqua Rebell Orb Checker White - Nano
Diameter ca. 25 mm
Aqua Rebell Orb Checker White - Normal
Diameter ca. 35 mm

Aqua Rebell

Aqua Rebell

Aqua Rebell is our own aquatic plant fertiliser label. A great number of planted tank enthusiasts in general and aquascapers in particular use our products to supply their aquarium plants with nutrients.

When developing fertilisers and other aquascaping-related products, we work hand in hand with a base of aquarium enthusiasts and aquascapers, and we try to realise as many of their desires and ideas as possible. Quite often, ideas and wishes uttered in our aquatic plant lovers' and aquascapers' community are the basis, on which we develop new products. These are then thoroughly tested by experienced aquarium keepers and aquascapers. Behind our product range, there are a lot of innovative ideas and long-term experience, and they are tested in real life. For us it is important that aquarium keepers and aquascapers are successful with our products and that they are thus enabled to make the utmost of their tanks and aquascapes.

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