1. Collect samples of soil from the test area. (The soil should be taken from the same depth below the surface each time you test.) It is suggested to take at least two samples per test. The more samples, the more accurate the measurement will be. Take more samples around your plant and mix them. You will get a homogenous sample.

2. Take the homogeneous sample. Weigh out 1 unit soil (100 g is recommended).

3. Add 2 unit (200 ml) distilled water to it.

4. Stir the sample for 30 seconds.

5. Let it sit for 15 minutes.

6. Filter liquid into clean cup.

7. Stir it again, then take your measurement with Adwa EC meter.
Hold the electrode in the sample min. 1 minute before the reading.