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Most of us use a drop checker to measure co2. You can DIY one or order one off of ebay for about $13/shipped. You fill it with 4 dKH solution, and add a drop of methylene blue(pH indicator solution).
You suction cup it to the side of your tank. After 30 minutes, you observe the color. Blue is too low in co2, green is just right, yellow is too high. Green is meant to signify 30 ppm of co2.
You suction cup it to the side of your tank. After 30 minutes, you observe the color. Blue is too low in co2, green is just right, yellow is too high. Green is meant to signify 30 ppm of co2.