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IQ Scientific/Hach Co. PH57-SS ISFET Piercing Tip pH Micro Probe with Heavy Duty Handle, 4.8 mm Diameter, Stainless Steel: Amazon.com: Industrial & Scientific
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Hach H138 H-Series H138 Elite miniLab ISFET pH Meter with Calibration Buffer Set: Amazon.com: Industrial & Scientific
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Hach H138 H-Series H138 Elite miniLab ISFET pH Meter with Calibration Buffer Set: Amazon.com: Industrial & Scientific
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Hach H138 H-Series H138 Elite miniLab ISFET pH Meter with Calibration Buffer Set: Amazon.com: Industrial & Scientific
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