I have also to make clear that TDS has a specified clearly value (i.e. x mg/lt), instead of Conductivity, which's value is also temperature dependant, as the ions "speed" is higher as temperature rises. The relation between Conductivity/ΔΤ is also no standard (usually 1-2,5%/°C), depending also from the ions type (MW, ionic strenght etc.). So, concerning Conductivity, you have always to mention the temperature measured, in order to be certain.

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I have also to make clear that TDS has a specified clearly value (i.e. x mg/lt), instead of Conductivity, which's value is also temperature dependant, as the ions "speed" is higher as temperature rises. The relation between Conductivity/ΔΤ is also no standard (usually 1-2,5%/°C), depending also from the ions type (MW, ionic strenght etc.). So, concerning Conductivity, you have always to mention the temperature measured, in order to be certain.