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Hach HQ30D53000000 HQ30d Portable pH, Conductivity, Optical Dissolved Oxygen (DO), ORP, and ISE Multi-Parameter Meter: Amazon.com: Industrial & Scientific
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Hach LPV4030.97.0002 SensION+ MM156 Portable pH/Conductivity/Dissolved Oxygen Multi-Meter: Amazon.com: Industrial & Scientific
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