Features: No batteries or electricity needed, plug and read. Easy & accurately to read moisture promotes healthy plants. This soil moisture meter is only for testing soil moisture level, make your plants can grow healthy and strong. 3.5" p robe length, simply insert the plants moisture meter into the soil , and you'll get your reading. No more for guess work, know what for time to water for your garden, flowers, plants both indoor and outdoor. Specifications: Material: Plastic Package size: approx 3.3x3.3x14.5cm/1.3x1.3x5.7in Red: 1-3(dry) Green: 4-7(good) Blue: 8-10( too wet) Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Soil Moisture Meter