OUTOPEN Kit CO2 System Concentration Fish Tank PH Accessories CO2 Indicator For Aquatic Plants CO2 Diffuser CO2 Monitor Indicator Monitor Glass Drop Checker

Package included:1 bottle x Indicator solution or 1 glass drop checkerTest solution capacity: 15ml Model: Musical note/Ball/Water drop/Hook Condition:100% Brand New,High Quality Materials:Borosilicate Glass Size:As picture show For: Aquarium plants grass Product: Aquarium CO2 Indicator Features

1. The change of the three colors of the detection fluid indicates the CO2 concentration of the fish tank.
2. The indicator made of glass is corrosion-resistant, simple and beautiful.
3. There are 4 types of glass drop checkers for you to choose.

Notes: 1.The test solution should be replaced once a month. 2. Please allowed 1-3mm differences due to manual measurement, thank you for your understanding! 3. Due to the difference between different monitors, please understand that the picture may not reflect the actual color of the item.