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Mettler Toledo SevenExcellence S400-30046241 pH/mV Meter, Kit, -2.000 to 20.000 pH Range, -2000 to 2000 mV Range: Science Lab Ph Meters: Amazon.com: Industrial & Scientific
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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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