CO2 Level Indicator
High quality of materials.
Easy to use and convenient to detect concentration of CO2.
Suitable for all kinds of fish tank.
Different color of liquid represents different concentration of CO2.
BLUE means that CO2’s concentration is too low.
GREEN means it is normal.
YELLOW means that CO2’s concentration is too high so that it is harm to fish.
A wonderful solution for feeding fish and observing their living condition.