A soil moisture meter is a device used to measure the amount of water present in the soil. It helps gardeners, farmers, and researchers determine when to water plants, ensuring they receive the right amount of moisture for healthy growth. The meter typically features a probe that is inserted into the soil, providing a reading on a display or gauge. These meters can be analog or digital, with some models offering additional features like temperature readings or light level indicators. By using a soil moisture meter, users can prevent overwatering or underwatering, promoting better plant health and more efficient water usage in gardening and agriculture.