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Snapklik.com : Bluelab Guardian Monitor Wi-Fi For Real-time pH, Temperature, And Conductivity (TDS) Measurements In Water
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Amazon.com: Bluelab MONGUACON Guardian Monitor Connect for pH, Temperature, and TDS in Water with Data Logging (Connect Stick not Included), Nutrient Meter for Hydroponic System and Indoor Plant Grow White : Industrial
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Bluelab Guardian Monitor - 2 year warranty (6 months on probe). – Sunset Hydroponics and Home Brewing
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