pH is critical to having a great crop. By measuring your pH, growers will know if plants can uptake the nutrients.
Soil: Optimale pH 5.8 – 6.2.
Hydro/Coco: Optimal pH around pH 5.8, for optimal nutrient absorption.
*It is suggested to let your pH fluctuate occasionally because this allows certain elements to be absorbed slightly better than when the pH stays at a single pH rate.