3 Way Soil Meter Measure Soil Moisture from Dry to Moist to Wet on a Scale of 0 to 10 Measures the Amount of Light the Plant is Getting from 0 to 2000 Measures the Soils pH Level from 8 to 3.5 No Batteries Required and Can be Used Indoor and Outdoor Includes a Chart of Optimal Plant Light and Moisture Levels for a Variety of Plants