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Luster Leaf 1605 Rapitest Digital Soil Testing Kit. Electronic version of Luster Leafâs popular 1601 Soil Test Kit. The rapitest Digital Soil Tester utilizes advanced LED digital technology and patent-pending optical calibration system to read test colors. The system is calibrated to read small color variations that can be difficult to distinguish with the human eye. The tester is easy to use. Just follow the easy instructions for each soil pH, nitrogen, phosphorus or potash tests; slide the test tube in optical chamber and push the appropriate button to get the test results. Once you have your soil test results, the tester booklet tells you how to adjust soil pH and provides recommendations for fertilizers. The bookletâs pH preference list allows you to select plants for your soilâs pH or know how much to adjust the soil pH for your current plants. Luster Leaf 1605 Rapitest Digital Soil Testing Kit