Speciation: Size: 18 x 6.3 x 2.5cm / 7.08 x 2.48 x 0.98 inch (appr.) Probe Length: 8.5cm / 3.35 inch (appr.) Instructions for use: How to analyze soil fertility? 1. Remove the topsoil about 5 cm first; then smash the soil down to 13 cm deep. And clean up all the organic impurities in the soil that will affect the test results, such as leaves, roots and so on. 2. Soak the soil with water and make it muddy. (It is best to use rain or distilled water). 3. Wipe the probe with a clean cotton or paper towel. 4. Turn the function button to the first gear from the left. 5. Insert the probe into the soil to be tested until the soil is no more than 2.5 cm from the fuselage. Wait up to 10 seconds, and the data can be read after the pointer is stable. 6. Record the data. Remove the probe from the soil and thoroughly clean the probe. The judgment criteria of the analysis results are as follows: Lack of (TOO LITTLE) Nitrogen less than 50 ppm Phosphorus less than 4 ppm Potassium less than 50 ppm Ideal range (IDEAL) 50-200 ppm 4-14 ppm 50-200 ppm Package Included: 1 x Soil Moisture Meter and pH Level Tester Special Note: Please do not insert the probe into the soil for a long time, and do not use this device to test the liquid to avoid damage. Convenient to use, simple to operate, solid quality. Accuracy: About ±0.25 pH(20℃)±0.2 pH (Suitable for farm or education experiments). The PH level tester is lightweight and portable design, convenient for indoor and outdoor use. Battery is no need；this PH level tester could test soil pH soil fertility. Ideal soil test tool kit for flowers, vegetable, gardens, home potted plants,lawn and farm.