SIMPLE and EFFECTIVE: The soil moisture meter only for testing soil moisture, the basic model works stably. Plug and read, responds quickly and provides easy reading. Large dial, ten scales. Includes a watering guide for 200 plants printed on the back of the package. INDOOR AND OUTDOOR USE: A very useful tool for your garden, yard, lawn, farm, potted plants, etc. This is especially important for some delicate plants that are very sensitive to over or under watering. LONG PROBE SENSOR: 7.7" probe length specially designed to measure water at root level, for use on any plant, even large potted plants. NO BATTERIES REQUIRED, LIGHTWEIGHT: Compact and portable, plant water meter No batteries no electricity needed, place the sensor probe in the area of soil you want to check and instantly get an accurate reading. SIMPLIFIES YOUR LIFE - Accurate and easy to read.When you have lots of plants indoors, you don't have to remember when you watered this or that, just check each one with the moisture meter and water accordingly.