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No need to plug in or install batteries 3 in 1 design: Our 3-in-1 soil moisture meter combines moisture meter, pH acidity and light sensor together, not only help you save both precious time and money, but also let you know plant when to water, and if it has sufficient sunlight or soil pH is good for plant growth. Specifications: Color: Black PH Range: 3.5-8 pH (3.5-6.5 Acid, 7-8 Alkaline) Moisture Range: 1-10 (1-3 Dry, 4-7 Nor, 8-10 Wet) Relative Light: 0-2000 lux (0-200 Low, 200-500 Low+, 500-1000 Nor, 1000-2000 Hgh)