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3 in 1 design: Our 3-in-1 soil 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 for plant growth. It is, really a Helper for Your Garden and Lawns! Specifications: Color: Green 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) Product Size: 11.5 x 2.0 x 1.5 inches Copper Probe Diameter: 0.2 inch Aluminum Probe Diameter: 0.2 inch Probe Length: 7.9 inches Distance Between Probes: 0.5 inch Product Weight: 2 oz/56g How to Use: Step 1: Switch to moisture/pH/light position according to demand . Step 2: Insert the probe into the soil about 2-4 inches . Step 3: Adjust the position of the probe until the pointer on the dial swing slightly . Step 4: Check moisture/pH/light level in the dial after 10 minutes . Step 5: Remove probe from soil and wipe clean after each use . Kindly Note: 1. Do not force it into very hard soil or touch hard objects since it will be easy to damage the probe . 2. Do not use it to test pure water or other liquids. It can only be used to measure soil . 3. Do not leave the meter in the soil for a long time . 4. Please wipe and clean the probe after each use . 5. If the soil is too dry the indicator will not move, and water it before testing.