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ECF120 Probe User's Manual <br />2. About the ECH20 Probes <br />i 0101W MI- :Ili EEKOI iqflfalol <br />The E 2 probe measures the dielectric constant of the <br />soil in order to find its volumetric water content. Since the <br />dielectric constant of water is much higher than that of air <br />or soil minerals, the dielectric constant of the soil is a sen- <br />sitive measure of water content. The EC H20 probe has a <br />very low power requirement and high resolution. This <br />gives you the ability to make as many measurements as <br />you want (even hourly) over a long period of time (like a <br />growing season, for example), with minimal battery usage. <br />fil; M-[X�Iilm <br />The EG5 varies from its EG 10 and EG20 cousins. <br />Although the principles of measurement are the same, its <br />two -prong design and higher measurement frequency <br />allows the EG5 to measure VWC from 0 to 100%, and <br />allows accurate measurement of all soil types and a much <br />-wider range of salinities. <br />4 <br />