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256 Posts
I know the drop checker isn't the most precise measuring tool...but I have found it to be most useful. It's cheap and does the job with accurate test solution. It's been very useful for me to keep a consistent amount of co2 in my tank. After a few weeks, I became very good at looking at the shade of green and knowing where the sweet spot was for my plants and fish. Lime green is the most my fish can handle...and my plants do well.