Features: [Monitoring]Professional pH tester is used to test the pH, light, and moisture of soil to help achieve the optimal level for crop growth. [Moisture Test]When the value is 1-3(Red), watering is required. Values of 4-7(Green) indicate that the moisture content is appropriate. A value of 8-10(Blue) indicates too much water. [Light Test]The range of light measurement is 0-1000 lumens. The larger the value, the stronger the light. [Easy to use]No battery required, just insert the probe into the measured terrain (with a depth of at least 10cm) to get exact and precise data. [Widely Applicable]Ideal for garden, lawn, farm, indoor outdoor, both soil-less mixtures, and soil has grown plants.