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Does anyone know how to build a Paramagnetic Soil Meter?


Does anyone know how to build one of these, a Paramagnetic Count Soil Meter, follow the link. http://www.nutri-tech.com.au/downloads/product_information_sheets/Energy%20Devices/PCSM%20-%20Phil%20Callahan%20Soil%20Meter.pdf I know it consists of two air coils with an impedance circuit measuring the difference between two coils when a low level magnetic substance is placed in one of the coils. Can anyone help?

 

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