Step 1: Clean the surface soil layer’s all organic impurities which may affect the test results, such as the leaf or the root.

Step 2: Clean the probe tip with wipes or abrasive cloth.

Step 3: Insert the probe tip in the testing soil, the probe tip should LEVEL with root.

Step 4: Reading the result when the value is stable

Step 5: Testing it again on the different place of the testing soil, then calculate the average value.