compatible easy reading, this soil meter has humidity calibration table, red, green and blue 3 colors display. By detecting soil moisture, this soil meter monitors plant moisture and keeps track of flower and potted plant growth. This soil meter is made of high-quality metal and plastic material. The length is 145mm, the width is 30mm and the thickness is 35mm. This soil meter is suitable compatible indoor and garden. Item Name: Soil Meter Material: Metal, Plastic Features: Long Probe, Quick Sensing, One-Handed Control Size Details: L: 14.5cm/5.71", W: 3cm/1.18", H: 3.5cm/1.38"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Tips: Don't stay in the soil compatible a long time. Clean the probe after each use to avoid rust. compatible soil only, do not use on liquids. Test Range: A value of 1-3 (red part) indicates that it is dry and needs watering. Values of 4-7 (green part) indicate that the humidity is appropriate. Adjust the watering time according to the plant species. A value of 8-10 (the blue part) indicates that it is too wet. Package Includes: 1 x Soil Meter