This product is most suitable for detecting nutrient soil, and the detected value be more accurate. For soil, red soil and other soils with low density or too muddy, the meter needle may not move due to the poor conductivity of the soil, and you can change the test. Environment recheck. This product is only suitable for soil testing. It is not suitable for liquid, dry flour, , sawdust, bark, etc., and soils with extremely low soil density, loose soils with poor conductivity, and mixed soils. It cannot be inserted in the soil for a long time, so as not to damage the electrode probe. When using, be careful not to insert the probe into the stone, and do not use too much force, otherwise the electrode probe be easily damaged. After use, please wash it with clean water and dry it with a rag. This product cannot be soaked in water, and cannot be wiped with solubility, so as to avoid vibration, impact and extrusion of the product, which may affect the accuracy of measurement or damage.