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(One Piece ) Soil Tester- Analyzer 4Way Rapite From Luster Leaf (Part Number 1880). The rapitest 4-way Analyzer was designed and engineered in the USA to help gardeners measure 3 important soil requirements and sunlight levels, for more successful gardening: Soil pH to determine if soil is acidic or alkaline; total measurement of N, P and K to determine if plants are over or under fertilized; and a soil moisture reading to help prevent over watering of plants. The meter is also calibrated to the Mean Solar Table developed by USDA. It is designed and engineered solely to measure sunlight for plants. The meter uses an exclusive purple chromatic filter to color correct light for plants. No batteries required for operation. (One Piece ) Soil Tester- Analyzer 4Way Rapite From Luster Leaf (Part Number 1880)