![Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else](https://m.media-amazon.com/images/I/61ViTXjPWzL._AC_UF350,350_QL80_.jpg)
Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else
![Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else](https://images-na.ssl-images-amazon.com/images/I/51orZrwTs4L._AC_UL900_SR615,900_.jpg)
Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else
![Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else](https://m.media-amazon.com/images/I/717-j-aJPNL._AC_UF350,350_QL80_.jpg)
Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else
![Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else](https://m.media-amazon.com/images/I/61RlDfGB-AL.jpg)
Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else
![Why is my co2 drop checker constantly blue? I am using the JBL Permanent Co2 plus pH Aquatest. The instructions indicate that you add 35 drops of the provided tester liquid into Why is my co2 drop checker constantly blue? I am using the JBL Permanent Co2 plus pH Aquatest. The instructions indicate that you add 35 drops of the provided tester liquid into](https://preview.redd.it/jcl1ljk11es61.jpg?auto=webp&s=a1d5d0955924f9c60e7907d44c901c308c03aacb)
Why is my co2 drop checker constantly blue? I am using the JBL Permanent Co2 plus pH Aquatest. The instructions indicate that you add 35 drops of the provided tester liquid into
![Complete Package Ista Co2 Drop Checker Long Term Monitor Test Indicator with Real Time Solution Kit by Full Package, : Amazon.de: Pet Supplies Complete Package Ista Co2 Drop Checker Long Term Monitor Test Indicator with Real Time Solution Kit by Full Package, : Amazon.de: Pet Supplies](https://m.media-amazon.com/images/I/51OzdPT5rML._AC_.jpg)
Complete Package Ista Co2 Drop Checker Long Term Monitor Test Indicator with Real Time Solution Kit by Full Package, : Amazon.de: Pet Supplies
![Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else Amazon.com: Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup : Everything Else](https://m.media-amazon.com/images/S/aplus-media/sc/b23308f4-c691-4c83-bedd-193e587ac4ba.__CR4,0,970,600_PT0_SX970_V1___.png)