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Like the title says! how do i test and adjust my soils ph with a ph water pen? and why does it read in ppm? why doesn't my plan water have any reading? share your knowledge guys!

Hello everyone! i am new to growing and new here so any and all feedback is welcomed! currently i am growing 4 sour diesel and 2 Holland hope indoors. The lady's are 4 weeks into flowering and doing great! this is my second indoor grow and third grow total. my set up is in 4x4 room with 8 feet...