Hanna Instruments HI 3512 - Manual (Page 14)

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EC range
The conductivity range is from 0 to 400 mS/cm . The actual conductivity
range (the uncompensated conductivity) is up to 1000 mS/cm. The
instrument will display conductivity readings up to 1000 mS/cm.
Note: The symbol in front of the temperature reading means that the
temperature can be entered by the user (“Manual” option
selected in SETUP).
Resistivity range
The reciprocal of the conductivity of a material is the resistivity.
TDS range
A conductivity measured value can be corrected to a total disolved solids
value using the TDS factor (value entered in SETUP).
Salinity
The salinity is derived from the conductivity of a sample.
The percent of salinity in a sample is depending of the sample and on the
salinity coefficient.