Hanna Instruments GroLine Direct Soil and Soilless Media pH Electrode 1' x 8' Grow Trays & Flood Tables The N-P-K (3-1-2) ratio is

The N-P-K (3-1-2) ratio is recommended by the American Rose Society

Alarm set points

One Blade of Choice

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Hanna Instruments GroLine Direct Soil and Soilless Media pH Electrode 1' x 8' Grow Trays & Flood Tables The N-P-K (3-1-2) ratio isThe Hanna Instruments GroLine Direct Soil and Soilless Media pH Electrode is a pH electrode for the direct measurement of pH in soil and soilless media. The Hanna Instruments GroLine Direct Soil and Soilless Media pH Electrode is a glass body, refillable, single junction pH electrode with a DIN connector that is compatible with the HI9814 Groline portable pH EC TDS meter. This electrode has a triple ceramic junction in the outer reference cell and the