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Rapitest Soil Test Replacement Kit. Soil testing in 3 easy steps. Just mix soil with water, pour liquid into comparator, and add contents of capsule to instantly compare color for test reading. Test Kit contains materials for 40 tests: 10 tests each for pH, nitrogen, phosphorus, and potash. Instructions included. Replacement Set contains 40 capsules to complete 10 tests each for pH, nitrogen, phosphorus, and potash. Rapitest Soil Test Replacement Kit