This 8-in-1 soil tester for plants reads pH, moisture, EC, temperature, light, and an NPK estimate, and sends the data to your phone. Unlike USB-only probes, it works with both...

This 6-in-1 tester focuses on nutrients: it reads nitrogen (N), phosphorus (P), and potassium (K) along with moisture and temperature, and grades your soil from Deficient to Rich so a...