Comparing water array with conventional unit (YSI Professional Plus)

One of the requirements of the Testing the Waters’s grant with WI DNR was to conduct a comparison of our array with a conventional, trusted unit. We finally got access to a professional-grade unit, a YSI Professional Plus (thanks Dr. Dale Splinter!). This unit is around $3,000 for the dissolved oxygen, conductivity, temperature, and pH probes that it has with it.

Here’s a link to the full analysis: Comparison of array with YSI unit.

Overall, we found a small absolute difference between the two units, but their relative measurements (identifying changes in a parameter while sampling) was very similar. For example, here’s conductivity:

Comparison with YSI – Conductivity

Here’s a scatter plot of paired measurements with a trend line (R² = 0.994):

Scatterplot of paired values – Conductivity