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The PS-525 displays airspeed in Knots, MPH, or KPH. Both are given in increments of 1. The Knots display will indicate up to 500 Knots, MPH will indicate up to 575 MPH, and the KPH will display from 34 to 920 KPH.
By pressing the Units Select button, the choice of speed can be changed to KPH and Knots.