The soil pH value plays a very important factor in the production of high-quality plants, most crops can not survive in the soil too acidic or too basic, therefore the appropriate pH value of the best plants is valid: Application: pH and humidity tester: pH (Acidness): 3 -8 pH Moisture: 1-8 (10-80%) Resolution: 0.2 pH Accuracy: 0.2 pH - Suitable for field and school experiments in agriculture Working temperature: 5-50 C (41-122 F) Calibration: Gently wipe to remove oxides from the metal electrode application: garden pots, lawn pots, greenhouse, vegetables as used 1. Delete any obstacles from soil 2. Clean the probe tips 3. Insert the meter for soil 4. I am waiting for 10 minutes 5 . Press the white button, the correct humidity value will be displayed. NOTE 1. Do not leaving a metal part of the soil test for too long (no longer than one hour), otherwise it will damage the metal surface. 2. Before starting, make sure that the metal surface is clean and dry 3. Do not use a tester near magnetic objects and keep it away from other metal objects 4. Do not measure the liquid, 5. Do not hold the tester with your fingers on a metal surface 6. No You can test the organic soil, sand, bark, wood chips, caries, cement.