High Sensitivity Soil Moisture Meter for Measurement pHKey Features "Soil pH value 5. 0 become toxic to plant growth. The optimum for most plants from 5. 5 to 7. 0 range." 1. Get Readings by a Single Press Place the tester into the soil and get the reading easily by pressing the button Both Moisture and pH values are shown 2. Pointed and Sharp Metal Probe Easy to drill into deeper part of the soil Be able to drill down into 6 cm * Please clean the metal probe each time after use to avoid getting rusty. 3.