Toggle menu. my account. Sign in Register Gift Certificates. Electronic version of Luster Leaf’s 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. Buy Luster Leaf 1605 Rapitest Digital Soil Testing Kit, Model: 1605, Home/Garden & Outdoor Store: Accessories - Amazon.com FREE DELIVERY possible on eligible purchases. "/>Luster leaf 1605 digital soil test kit