P.I.N.D.A. 2 probe has a special thermistor embedded inside. The reason is, that normal induction sensors have a temperature drift, meaning that different temperatures might cause the probe to trigger at a different height. Now we can compensate for it, so you can leave the printer preheated for hours and the first layer will always be spot on!
Installation instructions for the nozzle cooling fan: Original Prusa i3 MK3 kit assembly manual - Step 23 Mounting the P.I.N.D.A. probe