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Horticultural nutrient strengths are measured in TDS (Total Dissolved Solids), by EC (Electrical Conductivity) or by CF (Conductivity Factor). The higher the reading, the stronger the concentration of nutrients in solution. Careful monitoring and adjustment are the key to healthy growth and prevention of over or under fertilisation. Formerly known as New Zealand Hydroponics, Bluelab products make the Truncheon. It is a time tested, popular favourite among hydro growers. Simple, accurate, reliable, waterproof and built to last....you can't go wrong with a truncheon.
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