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Hanna pH Soil Tester GroLine - HI981030 buy10get10 That leonardite-derived humic acids profileHanna Instruments GroLine Soil pH Tester HI981030 is a pocket soil pH tester for direct pH checks in soil and soil slurries. Built for quick field style readings, this portable soil pH meter focuses on simple, reliable soil pH testing for environmental and agricultural testing. At the core is a specialized electrode designed for spot checking the pH of soil and soil slurries. The built in probe uses an open reference junction that helps it handle