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Lusterleaf Digital Plus Soil pH Meter (Set of 6)See on Walmart
Monitoring a plant's soil pH level helps guide towards ideal conditions for growth. Take the guesswork out of testing soil pH with built-in storage of ideal conditions for your own list of favorite plants. Display offers instant digital read-out, and detachable stainless steel probe checks soil pH at root level. Device includes electronic database of plant preferences. Meter database includes pH preferences for over 400 fruits, flowers, grasses, vegetables and landscape plants. Batteries included.... read more.