How to use
1. Measure the pH of the soil and research the deepest possible and then research the upper part of about 1cm
2. The table shows the value from 2.5 to 9. The basic value of 7 is neutral and the lower the value the acidity is high. Adjust the pH value of the soil according to the type of plants.
4. Be careful to insert the electrode in order to avoid contact with the stone. The electrode is prone to damage, so it is not too hard, so it should be cleaned after use.