JBL ProAqua Test Kit CO2 pH Permanent aquarium drop checker fresh water 4014162241382 | eBay
JBL CO2-pH Permanent Test
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
JBL's Permanent CO2 Aquarium Test - YouTube
Aquasabi - CO2 Drop Checker - Standard | Aquasabi - Aquascaping Shop