I just set up basic 1 the way I want it. I have found 12 khz to be very good and it will find absolutely the tiniest conductive targets just like 18 khz. The machine will split hairs for a lack of better words. If you get a conductive sound you can bet something is there always. If you have iron and a conductive sound right there in it on it around it or splitting hairs up against it, you can bet it's there. Always, I'll repeat this one, always dig anything conductive. Even if you think it's wrapping around per iron. Dig the 99's and the 98's or you are missing good stuff period. Remember you are splitting hairs like you have never done before with a detector.