HANNA's comprehensive line of Conductivity and TDS meters offer dedicated single parameter instruments, as well as multiparameter instruments that support up to eight parameters including salinity and resistivity.

What is EC?

Electrical Conductivity (EC) is defined by the ability of a solution to conduct an electrical current.

What is TDS?

Total Dissolved Solids (TDS) is defined as the amount of solids dissolved in a solution.

How does an EC/TDS meter work?

Two electrodes with an applied AC voltage are placed in the solution. This creates a current dependent upon the conductive nature of the solution. The meter reads this current and displays in either conductivity (EC) or ppm (TDS).

How is TDS measured?

By means of a conductivity meter. The conductivity is measured and the TDS is calculated by a fixed mathematical formula in the meter.

What is the difference between microSiemens and milliSiemens?

Both are units of conductivity. 1000 microSiemens (µS) = 1 milliSiemen (mS).

If I have a TDS meter with a 0.5 conversion factor how do I convert to the correct 0.7 value?

Multiply by 1.4; ex: 500 x 1.4 = 700.

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