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Rapitest (Luster Leaf Gardening Supplies) kits and meters help you test soil and environmental conditions for your indoor and outdoor garden. Use Rapitest probes and meters to measure and test light intensity, soil pH, soil moisture, soil fertility, and more. The Rapitest Soil Test Kit is even able to test for levels of Nitrogen, Phosphorous, and Potassium in your growing media. Visit Rapitest's website for more information and downloads for their products.