BLAU Glass Drop checker

BLAU Glass Drop checker

With this glass BLAU CO2 drop checker you can easily monitor the CO2 content in a planted aquarium. Color of the added CO2 indicator fluid changes when CO2 is not within the desired parameters.  

Blue indicates too little CO2, yellow indicated there is to much CO2 and green tells you the CO2 contents is correct.
Please note that the indicator fluid takes sereral hours to react, so corresponding color change is not noticable right away.

The liquid should be replaced every 4-6 weeks in order for the CO2 Indicator to work properly.

Size: 55x50 mm
CO2 liquid indicator not included