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Used by professional lawn care companies and nurseries. Wonderful for serious gardeners who want to check the ph. level in their garden. This soil ph. meter is simple and easy to use. Test your soil with accuracy and ease to determine if you need to adjust soil acidity. The ph. scale ranging from 0 to 14 is used to indicate acidity and alkalinity. A ph. of 7.0 is neutral, values below 7.0 are acid, and those above are alkaline. The lower the ph. the more acid is the soil. The higher the ph., the more alkaline. The ph. values of some common items are: Pure water, 7.0: Lemon juice, 2.2 to 2.4, orange juice, 3.4 to 4.0, fresh milk, 6.3 to 6.6, mild soap solution, 8.5 to 10.0, most Ontario soils, 4.5 to 8.0. Soil ph. is important chiefly because of the many effects it has on biological and chemical activity of the soil, which effects the metabolism of your plants. To learn more about soil ph. there is a link below for your convenience. To test and regulate the ph. of your soil employ the Kelway soil ph. meter .