Bluelab Sample Tube and FittingsBring your reservoir parameters closer Compatible with: Bluelab Guardian Monitor, Bluelab Guardian Monitor Connect, Bluelab Pro Controller Perfect for reservoirs located more than 2 metres 6. 6 feet from your controller unit. Place probes directly into the tube ports for direct measurement of nutrient solution Fittings included: The Bluelab Sample Tube is not intended for use in a high pressure system. Do not exceed 15 psi.
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