Used for outdoor and indoor plants, gardens and lawns. Save water and energy, keep your plants, lawns, and flowers in their best condition. Easy to use, just insert and read. No battery required, easy to use. First remove about 5 cm of topsoil, and then mash the soil down to a depth of 13 cm. And clean up all organic impurities in the soil that will affect the test results, such as leaves, roots, etc. Soak the soil with water to make it muddy. Wipe the probe clean with a clean cotton or paper towel. Move the function key to the first gear from the left. Insert the probe into the tested soil until the distance between the soil and the body does not exceed 2.5 cm. Wait for 10 seconds, and the data can be read after the pointer is stable. Remove the probe from the soil and clean the probe thoroughly. Special note: Please do not insert the probe into the soil for a long time, and do not use this device to test liquids, so as not to cause damage to it.