What's The Difference Between These Two Different Meters?

msminnamouse

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What's the difference between these two different kinds of meters? Or are they the same?

It looks like the first one (the two meters in the first link) uses a wick, and the meter in the second link uses a wick and an electrode.

By difference, I mean *besides* what values they test for. I know the first one tests for four different things.
 
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