This is a question from one of our customers posted for the information of all.
Hello Peaceful Crew
I am wanting to purchase a hand-held meter. My issue is to get the Hanna Combo or the Oakton ph meter.
Can you tell me what EC’s are? And how is knowing TDS helpful? And then is there something else to know to be able to use these two soil characteristics?
Do both meters require reagents?
Thanks for anything you can share with us.
EC measures the electronic conductivity of a material. When testing soils, high clay content, higher moisture levels, increased salinity and higher Cation Exchange Capacity all result in better conductivity and therefore higher EC readings.
TDS (total dissolved solids) This basically measures everything in the water besides the water itself. It is a good way to measure salinity in a sample.
With many organic fertilizers, a lot of nutrients are bound up in carbon compounds, so they are not very conductive. The majority of the TDS load is from the sample’s ionic components. The main ionic load is from four negative ions (bicarbonate, carbonate, chloride and sulfate) and four positive ions (calcium, magnesium, sodium and potassium).
Both meters will require reagents to calibrate the meters. The 7.0 pH reference solution is a bare minimum, but using both the 7.0 and the 4.0 is much more accurate. If you get the combo unit, you also need the ERGS reference solution.
I hope this helps,
Peaceful Valley Farm Supply
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