High-quality materials: Made of high-quality materials, long service life. Practical, easy to use and easy to operate. Simple and intuitive, flashing quickly. Two detection modes: Manual and automatic. The soil is extremely dry and a red light flashes every 6 seconds to warn you to water immediately. Instructions: The green light flashes every two hours if the moisture is correct. The yellow light flashes three times every two hours when the soil is dry. Widely used: Suitable for indoor soil moisture testing of various plants and flowers.