The PH of the soil determines the nutrients that will be available to the plants from the soil. It is important both in the case of Soil or hydroponic gardening. If the PH of the soil will not in the right range, the plants won't get the desired nutrients. All the essential nutrients will not get absorbed into the soil. Some plants do well, at an acidic PH of 5-5.6 while some plants absorb more nutrients being at nutrient PH 7, or a slightly alkaline PH. The plants want to stay at their ‘sweet spot’ which PH 6.2, and for that, we need to measure and maintain PH with the help of PH meters.