Ideal ph level?

Ive always read that it should be around 6.2-6.7. Most growers i came across always had theirs at 6.3. It depends on organic or soilless medium. Which ones are you using?
 
I just took some tests of my ph level of the water and that is reading 6.4 however when I took a reading of the soil using a soil tester it came up with a reading of 1
 
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