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you can find sub 20$ usd ppm meters on ebay. they arent waterproof or the greatest but for the price theyre worth the money imho.

Folding@home - Wikipedia, the free encyclopedia its basicly a computer program people use that runs in the background and uses many peoples computers to process data to help fight against cancer and other disease. theres alot of people who do it to see how many units they can do in a days time...

just built a modified version of this system have only done plain water test so far but looks like its going to work great for me. definantly worth taking a look at https://www.rollitup.org/hydroponics-aeroponics/22362-30-minute-6-plant-aero.html

If your looking for a great excuse for having 2 towers but only one monitor tell them the 2nd (or any others you might have) are for Folding @home its a distributed computing project that uses your otherwise wasted cpu cycles to fold simulated proteins to help fight against cancer and other...