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Ok understood, thanks again!

One more thing, i see that there are 2 different kind of sensors on the market, graphite and platinum. Do they both work in fresh water? What's the benefit of the expensive platinum one?

Günter, thanks!

Thanks for your reply
That name difference makes sense, but still I am confused about the reach of that card only 2 mS? I must have my units wrong, but Isn't a value of 150-300 mS a more common...

Hi, I am looking into an expension card, but I dont know If I need the PL-0002 or the PL-0004.
I am confused about their reach, the 0004 can measure up to 100mS according your website, but isnt that...