Observation: 1-3 (red part) means watering is needed, 4-7 (green part) means soil moisture is moderate, watering time can be adjusted according to plant needs, 8-10 (blue part) means wet and no watering is required . Suitable for plantations, gardens, indoor potted plants, etc. Only suitable for soil, do not use for liquids. Tip:Do not insert the probe into hard soil. Don't stay in the soil for a long time. Clean the probe after each use to avoid rust. Colour:Green Material:Plastic + Metal Size:145x35x30mm Package Contents: 10 x Soil Moisture Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.