How to take PH and adjust with a big plant in DWC

Title says it All, anyone got any tricks for adjusting P H in 5 fam bucket when the plant gets big?

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Put a hole in lid and use turkey baster to draw out solution to test then adjust slowly mixing ph up down with water so it won’t burn roots or use syringe and airline to add ph ± in bottom of res. In my system I use an empty slot to test and adjust though honestly prefer to lift lid to see and smell roots

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