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Simple pH soil tester

Came across this circuit in my internet travels and then realized I needed a special sensor to go with it, so one is on the way and I will have to find a time to play around with it.

CJ KD2IIN and I talked on the net about this and he will help me calibrate it since he has commercial pH meters.

http://www.66pacific.com/ph/simplest-ph.aspx

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