The Planted Tank Forum - View Single Post - Arduino Diy pH probe
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Old 01-28-2013, 04:01 AM   #12
mistergreen
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oh, gotcha. it costs the same to buy a CO2 sensor whose max is 36ppm
or a bit more ($250) for a sensor whose max is 300ppm.

http://aquatictechtank.net/viewtopic...&t=11&start=10
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