If I take 2 measurements in the exact same spot (same prober holes) I get different readings...why?

Carmen -

It is impossible to measure the exact same spot with the same POGO or two different POGOs. Once you measure a spot, you now have voids in the turf. Another sensor in the same spot is not compressed against the turf/soil exactly the same way and that will impact the reading. If you move the sensor even right next to that spot, there may be slightly more or less organic matter, microbial activity, another root, or something even slightly different that affects the actual moisture content. We measure that moisture content (and EC as well in that zone) very precisely so any small change is picked up. It is always best to take an average set of representative readings across the zone. If you do that consistently with multiple devices, the average will be statistically close. But you should not expect to ever get the same reading in the same sample holes per above.

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