If you have one of the F75's it only makes sense to put the new Fx-1 Probe on it. IT is amazing. Still retains the ultra fast recovery as the stock coil. I love it. Thanks Tony at Tcmetaldetectors. Might have put this at the wrong place. Administrators how bout make a new place up on the Sunray Pinpointer board for the New Invader FX-1 for the Fisher F75 and F70.