well, this is a good question but the answer depends on the type of YSI MP.
so there is any different types of YSI with different parameters and also the quality depend on the calibration of the sensors and before and after measurement,
so first you have to specify the model of YSI you want to use. then we can have further discussion.
Thanks Dr. Mohamed Hassaan You always give us the hope.
Actually, I have one in my lap as you know and all time doing its calibration of props , so I think it well in measuring. But some reads from its props raising my doubts. The device is YSI 6-series 9620 V2