I have a question regarding the buoy water calibration method

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In the calibration process of this float-based water level measurement method, the boundary levels are measured: for light media it is 600, and for heavy media it is 1100. The actual zero point is calculated as 600*1400/1000 = 840; the actual range is 1100*1400/1000 = 1540. Since this value is greater than the float height of 1400, the variation range of the float is 1540 – 840 = 700. The virtual zero point is 1400 – 700 = 700, and the virtual range is also 1400. Water is poured until the level reaches the virtual zero point of 700, after which the values at these two points are used for calibration, with an input value of 0. irrigate to virtual range 1400, two-point calibration input 140. The fifth item is arbitrary point migration input 140. Release water to virtual zero 700 and see if 0 is displayed. irrigate to true zero 840, input 0 for the migration of any point in the fifth item. Verification is complete. I would like to ask everyone: what exactly does this so-called migration to any point mean? Put simply