Conductivity and TDS
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Are mg/L and ppm measurements equal?
At first glance, they appear to be two very different forms of measurement, but that’s not the case. They are both ratios, and to see how they align with each other, it’s easiest to start with ppm, or parts per million. As an example, let’s say you’re trying to determine the salinity of seawater... -
Convert to your preferred conductivity unit using our Conductivity Calculator
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Do I need to calibrate my EC or Conductivity meter, tester or pen?
All EC electrodes are affected by residue build up and age so they do need to be calibrated to maintain accuracy. All manufacturers of EC meters and testers recommend that you use their specific calibration solution. Most meter and tester manufacturers use high quality calibration solution mix an... -
How does temperature effect EC?
The optimum operational temperature is 77 F. Little degrading of accuracy is seen between 55 degrees and 85 degrees. To assist you in getting the most accurate measurement, many of Milwaukee Instruments EC units have Automatic Temperature Compensation (ATC) built in. When searching for specific m... -
Do not store your EC or TDS meter in any type of solution. After use of your EC or TDS unit, rinse the probe in either tap water or soapy water, to neutralize the acidic fluid that was tested.
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What do I need to measure conductivity?
Conductivity is important in a number of industries. It is particularly important in hydroponics. Pure water does not conduct electricity. Nutrient solutions are full of impurities due to the electrically charged nutrient ions. Measuring conductivity lets you manage the strength of your nutrient... -
EC Stands for Electrical Conductivity - which is the measurement of the ability of an aqueous solution to carry an electric current. It is measured with a small electrical current flowing between two probes set 1 centimeter apart. The EC as it is known, flows faster when a greater amount of salts...