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How to Use: Step 1: Switch to moisture/pH/light as needed; Step 2: Insert the probe into the soil about 2-4 inches; Step 3: Adjust the probe until the pointer on the dial swing slightly; Step 4: After Several minutes, Note moisture/pH/light level in the dial ; Step 5: Remove probe from soil and wipe clean after each use. 3-in-1 Soil pH Meter Plant Moisture The soil tester can let you know when to water your plants. You will never over/under water to your plants again with this soil tester. Light Test The soil tester can give your plants a light test, help you to determine if plant getting adequate light. pH Test The soil tester can help you to control pH level in soil, let you know if acidity or alkaliness is right for your lovely plants.