This soil moisture meter is designed for indoor & outdoor use to better know the condition of your plants through soil moisture monitoring. It helps you grasp when you need to water your plant, or if you are over/under watering. An ideal tool to help your plants grow healthier. Moisture Range: 1-10 (1-3 Dry, 4-7 Normal, 8-10 Wet) No batteries needed. Simple to Use: Step 1: Insert the probe into the soil at root level Step 2: Check moisture level on the dial, and water accordingly Step 3: Remove probe from soil and wipe clean after each use