Designed for economical on-site evaluations of soil fertility, the NPK-1 provides a simple, effective way for analysts to determine nitrogen (0-60 mg/L), phosphorus (0-130 mg/L), and potassium (0-250 mg/L) content of the soil. The kit also includes a Pocket Pal™ pH Tester for quick pH (0-14 pH units) measurements.
