Thanks Cecil,
The meter is brand new. I conditioned the probe in the solution like the manual requested. It has a new membrane and it was in the solution when I did the tests. I want to check the levels at different times of day and see what kind of fluctuations I get.
The probe has a built in temperature sensor for temperature compensation. It just says to keep the sensor under water in the sample to get the compensation. I did allow time for the sensor to get to equilibrium with the water temperature.
Does the reading in the pond sound normal? I read that 3 ppm is a minimum, and normal would be 5 to 10 ppm? Is that about right?
