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Hach 8507500 HQ40d Portable Dissolved Oxygen & Conductivity/TDS/Salinity Environmental Monitoring Package: Amazon.com: Industrial & Scientific
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HQ4300 Portable Multi-Meter, pH, Conductivity, TDS, Salinity, Dissolved Oxygen (DO), ORP, and ISE, 3 channels, w/o electrodes | Hach
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