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The indicator solution covers a broad pH range from 4
Important: Do not apply the dry concentrate directly to plant roots or growing media
Add exactly three drops of pH Test Indicator
Protect them from drying air
Provides a highly soluble source of natural nitrogen from nettle extract and non-GMO soybean fermentation extract
General Hydroponics 1500 PPM TDS Calibration Solution Seedling Trays & Domes The indicator solution covers aMaintain reliable nutrient readings with General Hydroponics 1500 PPM TDS Calibration Solution. This precisely prepared reference solution is designed for calibrating compatible TDS and conductivity meters used to monitor hydroponic reservoirs, fertilizer solutions, source water, and irrigation systems. Regular calibration helps growers identify inaccurate or drifting meter readings before they lead to incorrect nutrient concentrations. The 1500 ppm
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