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3-IN-1 FUNCTIONS: 1.Measures moisture content of soil to lets you know when to water 2.Helps you determine if plant is getting adequate light 3. Helps you control PH level in soil, acidic or alkaline is suitable for your plants, You will never plant your lovely flowers into high-acid or Extreme alkalinity soil How to use the instrument: 1.DRY means your plant is dry, WET means your plant is moist The value 1-3 (red part) indicates that watering is required; The value 4-7 (green part) is suitable, please adjust the watering time according to the variety of plants; The value 8-10 (blue part) indicates that it is too wet; 2. The light measurement range is 0-200. The larger the value, the stronger the light. Please decide whether you need shade according to the variety of plants 3. PH measurement range is 8-3.5, the value is 7 is basically neutral, the smaller the value is, the greater the acidity, please adjust the soil pH according to the plant species.