The values measured by another device may be different from those of your ICO. In fact, this is perfectly normal.
This difference can be explained by the variation of the measured values by location, time and even depth, where they are measured. Two measurements, which are carried out by two different instruments with different technology, are therefore rarely identical.
However, if you notice a “big” difference between the readings of your ICO and those of another device, you can calibrate your pH and redox sensors at any time via the application.