Hy all:
I=B4m looking for a cheap  ph sensor for soil. I=B4m working on a =
gardening project and i need to check temperature, humidity and PH.  =
These three measurements will be interfaced  to a PIC ,after that the =
PIC will display the values. I=B4ve seen some PH probes on internet, but =
they are kind of expensive(70-100 U$D) for this project cause i need to =
place many of them in diferent places. Does anybody know if there is =
other cheaper way to mesure PH?. Thanks=20
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