Luster Leaf 1601 Rapitest Soil Test Kit Price: $34.06 (as of 06/02/2023 18:34 PST- Details)

Innovative and inexpensive soil test kit features an easy-to-use capsule system and color comparators
Contains tests for pH, nitrogen, pHospHorus, and potassium levels, 40 tests in total
Also has a chart of pH and NPK levels for more than 100 plants