This method is “old school” easy to use and reliable. Digital pH meters need to be calibrated to give an accurate reading. This test kit is ready to use straight out of the box. It comes with pH Up and Down solutions to correct the pH in a stable way rather than using kitchen ingredients. Check out the Oklahoma State University extension site for a handy chart on the proper pH for hydroponic plants:
https://extension.okstate.edu/fact-sheets/electrical-conductivity-and-ph-guide-for-hydroponics.html
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Amazon Links to items used in the video:
General Hydroponics pH Test Kit: https://amzn.to/3pJx1Ck
pH Digital Meter: https://amzn.to/31RwHJR
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Mars Hydro TSL 2000W Grow Light: https://amzn.to/2XM4JgR
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Thanks for your time ,your right I can never calibrate that tester !!!!!!