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Hach HQ40D Multi Meter, PH, Conductivity Salinity, TDS Software Ver 3.0.0.756 | eBay
Hach HQ1140 Portable Conductivity/Salinity/TDS Meter, - YouTube
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Hach 'HQ' Series Meters: Advanced Water Quality Monitoring: Oxygen/pH/Temperature/Conductivity/Salinity/TDS
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