Rangkaian amplier PH untuk elektroda PH

If you really want to make a Ph sensor,is is a link where I found a way to make it: http://users.bigpond.net.au/eagle33/elect/ph-cct.htm
Actually if u read from the link above pH sensor is built with a combined pH electrode with differential amplifiers ...
can I know what's best for ph electrode? plz anyone can give me the model ph electrodes are available in the market today.
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