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 a bit too low for fresh water? I am happy with a conductivity of around 200.
Then 0002 does no more then 2mS?

Robert