VIVOSUN Soil Tester, 3-in-1 Plant Moisture Meter Light and PH Tester for Home, Garden, Lawn, Farm, Indoor & Outdoor Use, Promote Plants Healthy Growth 3-in-1 Plant moisture sensor meter can test soil moisture light and pH (Design for testing soil ONLY. Do not be used to test pure water or other liquid) Let you know your soil when to water, control pH level, determine if plant getting adequate light Moisture Range:1-10(dry to moist);Light range: 0-2000(low light to strong light); pH range: 3.5-8 (acidic to 8 basic) Compact and portable design for indoor/outdoor use good for gardener or planter Durable and easy to use, plug and read,no battery needed