An NPK soil tester displays estimates for nitrogen (N), phosphorus (P), potassium (K), and soil temperature. The dual-needle probe makes it convenient to compare nutrient trends directly in the root...

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 rechargeable soil nutrient tester reads one main nutrient—nitrogen, phosphorus, or potassium, depending on the version you choose—on a large backlit screen, and charges over USB-C, so there are no...