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how to build pH meter??

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Elits

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ph meter schematic

Hi all,
i'll plan to make a pH meter for my school project...but i don't have any idea about how to measeure the pH. is anyone can help me...give me some reference, schematic, or anything...please
Thanks

Elits
 

build ph meter

"pH meter circuit"


"pH meter"
**broken link removed**

Regards,
IanP
 

build phmeter

IanP u r from malaysia?

how to construct one which instrumentation amplifier will i use?
 

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