sorry i do not know where the best place for this i try to post it to programming Tips & Trick
If wrong - please place this to the right place.
In last Time i allways search sensors by google and co - if i need a special sensor for values measured.
allways a lot of info come back and the most infos are can not used or not the right sensor.
I do not know, if you can need , but this example a germany side ( perhabs you can translate with google webtranslate )
http://www.diribo.de
examples:
http://www.diribo.de/sensor/
"" example "" ph Sensorik
http://www.diribo.de/search/ph-sensoren/
..
is nice.
If you know other ( english ) webside for searching senors would be fine if you post the link.
allways search for good Info links.
Best wishes
Rudi
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