Features: -- With the large dial and ten scales with different colors, red means dry, green means moist and blue means wet. Plug and read, responds quickly and provides easily readout -- Designed with single probe design, the moisture meter for house plants can keep roots intact and do not dig up to much soil after test, help your plants grow healthy, taking good care of your plants -- Just insert the probe tip into soil to the plant root level for several minutes, you can get the test result from the indicator pointer immediately. No Battery needed. Please wipe the soil moisture probe with a cloth after each use Kindly Note: 1. Do not force it into very hard soil or touch hard objects since it will be easy to damage the probe. 2. Do not use it to test pure water or other liquids. It can only be used to measure soil. 3. Do not leave the meter in the soil for a long time. 4. Please wipe and clean the probe after each use. 5. If the soil is too dry the indicator will not move, and water it before testing.