@MangoDudu,
Actually I know a lot of people use 18 hours of light but if you do some research you'll learn Cannabis plants are C3 plants. They dont need a dark period unless your trying to flower a photoperiod. What your seeing is my veg tent and it runs 24 hours because I run seedlings, autoflower, and Feminized. I do a perpetual grow system. Thank you for the advice, I do appreciate it. I did find a way to convert my TDS to EC so thanks again for that! I also store my meters like you said and I literally adjust and calibrate them before every single use. I like to be 100% on point. From my experience plants grow a lot faster and stronger under 24 hours of light too. Google C3 plants it's very very interesting information conducted by professional growers and Universities.
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