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Ultra-Long Premium pH Meter with Spear Electrode for Food, Water, Soil .etc, Waterproof, Dual Display, ATC, One-Touch Calibration, Data Hold, Sleep Mode AZ8694: Amazon.com: Industrial & Scientific
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GAIN EXPRESS Waterproof pH Meter pH Pen Ultra-Long Electrode for Soil, Water, Food, Dual Display with ATC One-Touch Auto Calibration Data Hold Function: Amazon.com: Industrial & Scientific
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