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Bluelab pH Pen Ventilation Air Conditioning SNS 604A and SNS 604B are SNS 604A and SNS 604B are each one part nutrient additives to be used throughout the plants growing and flowering cycle Durable Construction: Built with high quality materials to withstand the demanding environment of hydroponic reservoirs Battery type: 1 x AAA alkaline 1 pH 1°C 1°F
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