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Conductivity Meters for Soil

Measure the EC (electrical conductivity) of soil, as well as water, compost, foliar sprays, etc.

Theoretically, ions registered by EC meters are small & mobile enough to be available to plants. Complexed ions (large array of simple ions) will not be counted by an EC meter (however, if soil contains a variety of active, healthy microbes, they...

Measure the EC (electrical conductivity) of soil, as well as water, compost, foliar sprays, etc.

Theoretically, ions registered by EC meters are small & mobile enough to be available to plants. Complexed ions (large array of simple ions) will not be counted by an EC meter (however, if soil contains a variety of active, healthy microbes, they can break down large ion clusters).

High quality water will have a low EC reading

High EC soils are very susceptible to nematodes

Viability of seed germination can be determined by EC

EC of finished compost is an indication of its quality

Notes on EC meters/probes:

All of the conductivity meters listed here have ATC (Auto Temperature Compensation), which removes errors due to changes in temperature.

All EC testers require the use of a standard solution in order to calibrate properly before performing your tests. For those meters that don’t include standards, the solutions are sold separately.

EC probes differ in their technology. For example, the 4-Ring potentiometric probe type (found on the D-4C and 9033EC models) is more accurate & reliable throughout the entire range than the 2-Ring amperometric type.

The flat sensor design of the LAQUAtwin EC meter allows it to get a reading with just a few drops of sample making it suitable for plant sap analysis.

Units of measurement:

Electrical Conductivity (EC) is measured in micro Siemens/cm (or µS/cm) or in milli Siemen/cm (mS/cm). For simplicity, we use “µS” and “mS” here. 1 mS equals 1,000 µS. (Micro Siemens was formerly referred to as micro mhos).

For conversion into “C” Salt Units: 1 “C” Salt Unit = 700 µS.

General notes:

For soil EC: Plant growth depends on the quantity of mobile ions measured in soil / water extract (this measurement is also called ERGS or energy released per gram of soil). ERGS should be kept between 40 - 400 µS.

For plant tissue EC: EC of plant sap indicates the level of simple ion uptake in plants. These are ions that are small and mobile (not yet complexed into larger molecules). Try to keep between 2,000 - 12,000 µS for optimal growth on most plants.

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Conductivity Meters for Soil There are 9 products.

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