Answer: RapidTest, Vigoro Soil Test Kit, and La Motte are all brands found at most Home Depot garden centers. All will do an adequate job of detecting soil acidity or alkalinity. For more extensive information (nutrient analysis, etc.) you may want to have your soil tested by a local analytical lab or your cooperative extension office. These tests are more expensive, but also more comprehensive. However, if you're just interested in the soil pH, any of the above home garden soil test kits will provide accurate information.
Best wishes with your garden!
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